The best home cardio machine depends on what you want from it. For maximum calorie burn and running fitness, a treadmill is the clear winner. For gentle, joint-friendly workouts you can sustain long-term, an exercise bike is hard to beat. And if you want one machine that works your entire body with minimal impact, a cross trainer (elliptical) splits the difference.
According to the Australian Institute of Health and Welfare (2022), 37% of Australian adults don't meet aerobic activity guidelines — and choosing the right machine for your goals makes sticking with it significantly more likely.
If you have a joint condition, are recovering from surgery, or haven't exercised regularly in the past six months, check with your GP or physiotherapist before starting a new cardio programme.
Key Takeaways
- Treadmills burn approximately 15–25% more calories per hour than bikes or cross trainers at the same perceived effort.
- Exercise bikes are non-weight-bearing and are recommended by physiotherapists for knee osteoarthritis, ACL recovery, and post-surgery rehabilitation.
- Cross trainers are the only machine that activates both upper and lower body muscles simultaneously, based on peer-reviewed EMG research.
- Exercise bikes have the smallest footprint — around 0.7 m² — compared to a treadmill's 1.8 m².
- All three machines will improve cardiovascular fitness; the "best" choice is whichever one you'll actually use consistently.
- Every treadmill, exercise bike, and cross trainer at Cardio Online comes with a 100-day home trial — so you can test your choice properly before committing.
In this article:
- Quick comparison at a glance
- Which machine burns more calories?
- Is a treadmill hard on your joints?
- What muscles does each machine work?
- Space, cost and noise
- Which machine is right for you?
- Frequently asked questions
Quick Comparison at a Glance
The short version: each machine has a different strength. This table covers the six factors that matter most for a home gym decision.
| Treadmill | Exercise Bike | Cross Trainer | |
|---|---|---|---|
| Calorie burn (70 kg, moderate-high) | ~600 kcal/hr | ~400 kcal/hr | ~450 kcal/hr |
| Joint impact | High (weight-bearing) | Low (non-weight-bearing) | Low (non-weight-bearing) |
| Muscle focus | Lower body + core | Lower body | Full body |
| Footprint | ~1.8 m × 0.9 m | ~0.6 m × 1.2 m | ~1.2 m × 0.7 m |
| Starting price (AU) | From ~$900 | From ~$500 | From ~$900 |
| Beginner-friendliness | Moderate | High | Moderate |
For a deeper product-level comparison, see our guides to the best treadmills in Australia and the best exercise bikes in Australia.
Which Machine Burns More Calories?
Treadmills burn the most calories per hour — typically 15–25% more than a bike or cross trainer at the same level of effort. For a 70 kg person training at moderate-to-high intensity, that's roughly 600 kcal/hr on a treadmill, 450 kcal/hr on a cross trainer, and 400 kcal/hr on a stationary bike, according to data published by PureGym (2024) and Harvard Medical School calorie expenditure tables.
That said, calorie burn figures assume similar intensity levels across machines. In my experience, most people push harder on a treadmill — the walking or running motion naturally drives effort up — but they stay on the bike longer because it's more comfortable. A 60-minute moderate ride can match a 45-minute hard run for total energy expenditure.
The real calorie variable is intensity, not machine type. Both treadmill HIIT and exercise bike HIIT are highly effective fat-burning protocols when performed correctly. A PMC meta-analysis (2023) found that HIIT reduced body fat percentage by over 2% regardless of the cardio modality — on bikes, treadmills, and beyond.
The verdict: if burning the most calories in the shortest time is your only goal, run on a treadmill. But for sustainable, long-term fat loss, use whatever machine keeps you coming back.
Is a Treadmill Hard on Your Joints?
Yes — treadmills place meaningful load on your joints. Ground reaction forces during running reach 1.5–3× your body weight per stride, according to biomechanics research cited by Cleveland Clinic (2024). That load is exactly what builds bone density and strengthens connective tissue over time — but it also makes treadmills unsuitable if you have existing joint problems.
Exercise bikes and cross trainers are both non-weight-bearing. Your body weight is supported by the seat (bike) or the pedals (cross trainer), which removes the repetitive impact from your hips, knees, and ankles entirely.
I have a client in her early 60s who'd been avoiding all cardio for three years following knee replacement surgery. Her physiotherapist cleared her for stationary cycling before any other machine. She started at 15 minutes on light resistance and worked up to 45-minute sessions over six weeks. The bike gave her a way back into consistent exercise that the treadmill couldn't.
For conditions where joint load is a concern:
- Knee osteoarthritis: A systematic review and meta-analysis by Luan et al. (2021), published in Clinical Rehabilitation, found that stationary cycling significantly reduced pain and improved function in patients with knee osteoarthritis across multiple randomised controlled trials. Exercise bikes are widely recommended for this condition.
- ACL recovery and post-surgery rehabilitation: Non-weight-bearing cardio is standard protocol in the early stages. Are exercise bikes good for knees? — yes, for most knee conditions.
- General joint sensitivity: Cross trainers sit in a useful middle ground. The elliptical motion eliminates impact while still challenging the cardiovascular system. See our elliptical vs incline treadmill comparison for more on that specific trade-off.
If you're running on a treadmill and experiencing knee discomfort, treadmill cushioning makes a genuine difference — better-cushioned decks measurably reduce joint load on longer runs.
What Muscles Does Each Machine Work?
The three machines target your body in meaningfully different ways. This matters beyond muscle tone — it affects which exercises complement your cardio machine, and whether you need to add strength work alongside.
Treadmill
Treadmills are a lower-body and core exercise. Running and walking primarily activate the gluteus maximus, hamstrings, quadriceps, and gastrocnemius (calves), with significant involvement from hip flexors and core stabilisers on incline workouts. PMC research using electromyography (EMG) found that gastrocnemius and gluteus maximus are activated at higher levels during treadmill running than on either a bike or elliptical.
Your arms are involved in balance and momentum, but not in the same way as pushing a cross trainer's handles. I always remind my clients: running is a lower-body and core workout — and that's completely fine. If you want upper body strength, we add resistance work separately. If you're looking to build upper body strength alongside your cardio, you'll need to supplement treadmill sessions with resistance training.
The incline treadmill significantly increases glute and hamstring involvement. For reference: a 5% gradient raises calorie burn by approximately 52% compared to flat walking at the same speed, based on biomechanics data from Slider et al. (2015).
Exercise Bike
Exercise bikes are primarily a quadriceps and hamstring machine, with moderate glute activation (particularly on high-resistance pedalling) and minimal upper body or core involvement. The seated, supported position reduces core engagement compared to treadmill running — which is both a benefit (for those with lower back issues) and a limitation (for those seeking core conditioning).
Zone 2 training on an exercise bike is one of the most effective ways to build aerobic base and fat-burning capacity. Because the bike is low-impact and easy to hold a steady pace, it's ideal for the long, moderate sessions that drive fat oxidation adaptations.
Cross Trainer / Elliptical
Cross trainers are the most complete of the three for whole-body muscle activation. EMG research published in PMC (2012) found that elliptical training significantly activates upper extremity muscles — biceps, triceps, and trapezius — that treadmills and bikes do not engage to any meaningful degree.
The pushing and pulling motion through the handles engages your chest, back, and shoulders alongside the standard lower body work. This makes cross trainers useful if you want a time-efficient session that covers more muscle groups — particularly if your home gym has limited strength equipment.
The trade-off: exercise bike vs cross trainer for weight loss shows a similar calorie burn profile, so the choice between them often comes down to personal preference and joint health rather than pure fitness outcomes.
Space, Cost and Noise: What Fits Your Home?
These three factors — not fitness outcomes — often make the final decision for home gym buyers. A machine that's right for your fitness goals but wrong for your space or budget ends up in the garage collecting dust.
| Treadmill | Exercise Bike | Cross Trainer | |
|---|---|---|---|
| Footprint | 1.8 m × 0.9 m | 0.6 m × 1.2 m | 1.2 m × 0.7 m |
| Safety clearance | +0.5 m rear minimum | +0.3 m each side | +0.3 m each side |
| Noise level | Moderate–high (motor, footfall) | Quiet (magnetic resistance) | Quiet–moderate |
| Entry-level price (AU) | From ~$900 | From ~$500 | From ~$900 |
| Mid-range price (AU) | $1,500–$2,500 | $800–$1,500 | $1,200–$2,000 |
| Maintenance | Belt lubrication, deck checks | Minimal | Moderate |
Treadmills are the noisiest of the three — both from the motor and the impact of footfall. I've set up cardio equipment in apartments with thin floors where the neighbours noticed. If you're in a unit, or training at 6am while the family sleeps, this matters. Magnetic resistance bikes are nearly silent. Cross trainers land somewhere in between.
On space: if you're fitting a machine into a spare bedroom or apartment, an exercise bike gives you the most flexibility. The smallest models fold to a footprint not much larger than a bar stool.
For help planning your home gym layout around a treadmill or other cardio equipment, our home gym setup guide for Australia covers room sizing, flooring, and equipment sequencing by budget. If you're specifically weighing up a folding treadmill for a smaller room, our how to choose a treadmill in Australia guide walks through the trade-offs.
Which Machine Is Right for You?
After testing all three machine types with clients across a wide range of ages, fitness levels, and living situations, here is my honest breakdown.
Choose a treadmill if:
- Your primary goal is improving running fitness, speed, or endurance.
- You want the highest calorie burn per session.
- You're happy with the noise level and have space for the footprint.
- You plan to use incline training for added intensity (see incline treadmill benefits).
- You don't have existing hip, knee, or ankle conditions.
Treadmills are also the most versatile of the three — you can walk, jog, run, power walk at incline, or do interval sprints, all on the same machine. Browse our full treadmill collection to compare options by motor size, belt length, and budget.
Choose an exercise bike if:
- Joint health is your main concern — knees, hips, ankles, or post-surgery recovery.
- You want a machine you can use daily without accumulating impact load.
- Space is limited, or noise is a concern (early morning, apartment).
- You're a beginner and want a machine with no fall risk and a gentle learning curve.
- You're planning long Zone 2 cardio sessions (45–90 minutes at low-moderate intensity).
The exercise bike collection includes upright, recumbent, and spin bike options. Our exercise bike buying guide covers which type suits which use case.
Choose a cross trainer / elliptical if:
- You want a full-body workout that includes upper body muscles alongside lower body.
- You need low-impact cardio but want more challenge than a bike provides.
- You have moderate space and want a machine that's quieter than a treadmill.
- You're training for overall fitness and muscular balance rather than a specific athletic goal.
Browse all ellipticals and cross trainers at Cardio Online.
What if you can only choose one?
For most Australian home gym owners buying their first piece of cardio equipment, I recommend the exercise bike. It's the safest machine for beginners, the quietest to live with, the easiest to use, and the most joint-friendly option if your training consistency matters more than peak calorie burn. The best machine is the one you use regularly — and bikes win on adherence for most people in their 30s, 40s, and 50s.
If you're building toward a home gym with two pieces of cardio equipment, treadmill + exercise bike is my preferred pairing. They're genuinely complementary: the bike handles joint-friendly recovery days, while the treadmill provides the high-intensity sessions that drive cardiovascular adaptation. That combination covers every training need without redundancy.
All machines purchased from Cardio Online come with a 100-day money-back trial — if you try a machine at home and it doesn't work for your space or fitness goals, we'll organise the return with no fuss.
Frequently Asked Questions
Which machine burns the most calories: treadmill, bike, or cross trainer?
Treadmills burn the most calories per hour — approximately 600 kcal/hr for a 70 kg person at moderate-to-high intensity, compared to around 450 kcal/hr on a cross trainer and 400 kcal/hr on a stationary bike. That said, total calorie burn depends on session duration and intensity. A 60-minute moderate bike ride can match a 45-minute hard treadmill run. For calorie-focused training, compare treadmill vs exercise bike for weight loss in more detail.
Can I use an exercise bike if I have bad knees?
Yes — exercise bikes are recommended by physiotherapists for knee osteoarthritis, ACL recovery, and post-surgery rehabilitation. The seated, non-weight-bearing motion removes impact load from the knee joint entirely. A systematic review by Luan et al. (2021) found stationary cycling significantly reduced knee pain and improved function across multiple RCTs. Always consult your GP or physiotherapist before starting if you have an active injury or recent surgery.
Does a cross trainer really work your whole body?
More than a treadmill or bike, yes. Peer-reviewed EMG research shows that elliptical training significantly activates upper body muscles — including biceps, triceps, and trapezius — that treadmills and bikes do not engage meaningfully. The catch is that arm activation depends on actively pushing and pulling the handles, not just resting on them.
What is the best machine for a small apartment?
An exercise bike. The compact models have a footprint of around 0.6 m × 1.2 m — smaller than most office chairs. They're also quieter than treadmills, which matters in apartments where noise travels through floors. Some models fold flat when not in use.
Is a cross trainer the same as an elliptical?
Yes — "cross trainer," "elliptical," and "elliptical trainer" are interchangeable terms for the same type of machine. The pedal path traces an elliptical arc, which is where the name comes from. Some models add upper body arm levers (most common in gyms), while others have fixed handles.
Do I need more than one cardio machine for a home gym?
Not necessarily, but two machines complement each other well. The most useful pairing is a treadmill and an exercise bike — the treadmill handles high-intensity runs and incline workouts while the bike covers low-impact recovery days and Zone 2 training. For broader home gym planning, our home gym setup guide covers equipment combinations by budget.
References
- Australian Institute of Health and Welfare. (2024). Physical activity. AIHW. https://www.aihw.gov.au/reports/physical-activity/physical-activity
- Burnfield, J. M., Shu, Y., Buster, T. W., Taylor, A. P., Nelson, C. A., & Stergiou, N. (2012). Comparison of elliptical training, stationary cycling, treadmill walking and overground walking — Electromyographic patterns. Journal of Strength and Conditioning Research, 26(1), 131–141. https://pmc.ncbi.nlm.nih.gov/articles/PMC3299003/
- PureGym. (2024). Stationary bike vs treadmill vs elliptical: Which option should you choose? https://www.puregym.com/us/blog/stationary-bike-vs-treadmill-vs-elliptical-which-option-should-you-choose
- Harvard Medical School. (2021). Calories burned in 30 minutes for people of three different weights. Harvard Health Publishing. https://www.health.harvard.edu/diet-and-weight-loss/calories-burned-in-30-minutes-of-leisure-and-routine-activities
- Cleveland Clinic. (2024). Treadmill or elliptical: How to decide what's your best workout. https://health.clevelandclinic.org/treadmill-or-elliptical-how-to-decide-whats-your-best-workout
- Luan, L., El-Ansary, D., Adams, R., Wu, S., & Han, J. (2021). Knee osteoarthritis pain and exercise: A systematic review and meta-analysis of randomised controlled trials assessing the effects of stationary cycling. Clinical Rehabilitation, 35(4), 554–567. https://journals.sagepub.com/doi/abs/10.1177/0269215520971795
- Slider, A., Cattagni, T., & Mentiplay, B. (2015). Incline walking biomechanics and joint load. Journal of Biomechanics, 48(9). https://pmc.ncbi.nlm.nih.gov/articles/PMC4504736/
- Zenko, Z., & Ekkekakis, P. (2020). Maximal fat oxidation: Comparison between treadmill, elliptical, and rowing exercises. International Journal of Sports Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC7919349/
