Are Curved Treadmills Worth It? Benefits, Drawbacks and Costs
Curved treadmills are worth it for sprint, interval and conditioning work, and poor value for general fitness. The cheapest, the Sole C80, costs R33 196 — roughly what a premium motorised machine costs. Buy one for what it does differently, not as a general treadmill.
Curved treadmills attract strong opinions, most of them from people selling them. What follows is the case for and against, with the drawbacks stated as plainly as the benefits, so you can decide whether your training actually justifies the price.
Everything here refers to the curved treadmills we stock, priced R33 196 to R60 795.
What are the real benefits?
Force Fitness Track Runner, R60 795.
Instant speed change, a harder session at the same apparent effort, no motor to fail, and no electricity. The first of those is the one that changes how you train.
On a motorised machine, an interval starts when you press a button and the belt takes several seconds to accelerate. On a curved machine you simply move forward on the belt and you are sprinting. That removes the dead time from interval work, which over a twenty-minute session is a substantial share of it.
- No lag: speed changes are immediate and continuous
- Self-limiting: you cannot be thrown off by a belt running faster than you
- No motor: the most common expensive treadmill failure does not exist
- No power: site it anywhere, including outbuildings and covered outdoor areas
- Very long service life: far fewer parts that wear
Do curved treadmills burn more calories?
At the same running speed, yes — studies on self-powered treadmills generally find meaningfully higher heart rate and oxygen cost than motorised machines, because you are driving the belt rather than being carried by it.
The caveat matters, though, and it is usually left out. You cannot hold the same speed on a curved machine that you hold on a motorised one, so a real session is not a like-for-like comparison. What you get is a harder session per minute, not a magic multiplier on the same workout.
For weight loss specifically, that intensity is a mixed blessing. Harder sessions are shorter sessions, and total volume matters. Our guide to treadmills for weight loss covers why consistency usually beats intensity for that goal.
Do they improve running form?
They encourage a forefoot strike and a higher cadence, because the curve makes heel striking uncomfortable. Whether that counts as improvement depends entirely on what you are training for.
For a sprinter or a team-sport athlete, that bias is useful and matches how you move on grass or track. For a distance runner whose natural gait is a midfoot or heel strike, being pushed onto the forefoot for long periods is not obviously a good thing and can load the calf and Achilles more than they are used to.
The honest position: curved machines change your gait. Calling that change an improvement is a claim that depends on the athlete, and anyone who tells you otherwise is selling.
What are the drawbacks nobody mentions?
Sole C80, R33 196 — the entry price for the category.
Price, weight, noise, a real learning curve, and no incline. A curved treadmill costs three times a decent motorised home machine, weighs roughly double, and takes most people several sessions to run on comfortably.
The learning curve is real
First-time users almost always find it awkward. Controlling speed by body position rather than a button is unintuitive, and the first few minutes feel unstable. Most people adapt within two or three sessions, but in a commercial setting that means members trying it once and never returning unless someone shows them how.
No incline
The curve provides a fixed effective gradient and that is all you get. If hill training is part of your programme, a motorised machine with a powered incline from the treadmills range does something the curved machine cannot.
Noise
Slats on bearings under a sprinting adult are not quiet. This is a genuine consideration in an apartment or a shared building, and gym flooring underneath helps but does not eliminate it.
Weight and permanence
These machines do not fold and are awkward to move. Where you put it is where it lives. Measure the delivery route before you order.
Are curved treadmills safer?
In one specific way, yes: the belt cannot run faster than you, so the classic motorised-treadmill accident of being outpaced and thrown off is not possible. Stop moving and the belt stops.
That makes them well suited to unsupervised and group settings, which is part of why conditioning studios like them. It does not make them risk-free — the learning curve means new users can stumble, and running at genuine sprint speed carries its own risks regardless of the machine.
How do they compare at the same price?
| At around R33 000 – R41 000 | Curved | Motorised |
|---|---|---|
| Machine | Sole C80, R33 196 | Sole F85, R35 037 |
| Incline | Fixed curve only | Powered, adjustable |
| Screen | Basic console | 15.6 inch touchscreen |
| Folds | No | Yes |
| Sprint work | Excellent | Limited by belt lag |
| Long steady runs | Tiring, awkward | Excellent |
Prices are correct at the time of writing. Read that table as a specification of purpose rather than a scorecard — neither machine is better, they are for different training.
Who should buy one?
The Curve + Ski + Air Bike package, R99 104 — three conditioning stations.
Conditioning studios, sports teams, personal trainers and athletes whose training is genuinely interval-based. For those buyers the HIIT Runner at R41 997 or the Track Runner at R60 795 will earn their price.
For a full conditioning zone, the Curve Treadmill + Ski Trainer + Air Bike package at R99 104 is better value than buying the three separately. See HIIT equipment and the Force Fitness range.
Who should not?
Anyone whose main goal is general fitness, weight loss or steady-state running. A motorised machine at half the price will serve you better, and you will use it more.
Also anyone in an apartment or shared building, where the noise is a real problem, and anyone who needs a machine that folds away. Our post on quiet folding treadmills for apartments covers that case properly.
And anyone hoping to find a cheap one. There is no budget curved treadmill in South Africa or anywhere else, because the slatted belt and bearing assembly cannot be built down to a low price without failing.
So, worth it?
If your training is intervals, sprints and conditioning: yes, clearly. If it is running, walking and general fitness: no, and the money is better spent on a stronger motorised machine plus the rest of a home gym.
Tell us what your week of training actually looks like and we will tell you honestly which way to go — including when the answer is a R17 000 motorised machine rather than a R33 000 curved one. We would rather talk you out of a purchase than process a return.
We ship free anywhere in South Africa from Gqeberha. Curved machines are unusual enough that trying one first is sensible — look for a fitness showroom in your city if you can; for buying online, reach out and we will help you decide.
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