The health benefits of cycling

The standout finding here comes from a University of Copenhagen randomised trial, published in the International Journal of Obesity in 2017. Researchers took 130 overweight, inactive adults and split them into groups: one cycled to work (averaging 14 km a day), two did structured gym sessions, and one made no change. After six months, the bike commuters had lost 4.2 kg of fat mass, statistically on par with the high-intensity gym group’s 4.5 kg, and well ahead of the moderate-intensity group’s 2.6 kg.

The point isn’t that cycling beats the gym. It’s that it matches it, while costing you almost no extra time, because the exercise is the commute. You’re not carving out an hour you don’t have; you’re replacing a drive or a train ride.

How many calories you burn depends on the effort. A rough guide, per hour of riding:

The eBike numbers are the ones worth noticing. Even on high assist, an hour’s ride burns around 260 calories, roughly a croissant’s worth, for effort that doesn’t leave you drenched. Drop to low assist and that climbs to around 440, close to a push bike, while still taking the sting out of hills. You choose how hard you work by choosing the assist level.

Cycling isn’t just cardio. Every pedal stroke is a low-weight, high-repetition resistance movement, and over time that builds real muscle, especially in people who weren’t training before. A clinical cycling program measured an average 7% increase in quadriceps muscle volume, and the effect is most pronounced in untrained and older riders, whose legs respond to the steady resistance much like they would to light weights.

The load is spread across a chain of muscles. The quadriceps drive the downward push and do most of the work. The glutes fire at the top of the stroke, hardest when you climb or stand. The hamstrings draw the pedal back and up, and the calves transfer all of it into the pedal. Less obviously, your core works continuously to keep your hips stable, and your arms and shoulders engage to steer, brake and hold the bars.

For everyday riding, this builds lean, fatigue-resistant Type I muscle rather than bulk, the dense, enduring leg strength distance riders are known for. You won’t get bigger so much as stronger and more capable, which is exactly what most people are after.

This is where the evidence is strongest. A landmark University of Glasgow study, published in the BMJ in 2017, tracked 264,337 UK commuters over five years. Those who cycled to work had a 35% lower risk of developing cardiovascular disease and a 41% lower risk of dying early from any cause, compared with people who drove or took public transport. They also had a 45% lower risk of developing cancer. Few everyday habits move the numbers that far.

The mechanisms are well understood. Regular cycling acts like a natural blood-pressure treatment, consistent riding over a few months can lower systolic pressure by several points, enough to shift some people out of the hypertensive range without medication. And it keeps you in the right intensity zone almost the whole time: research on eBike riders finds they spend the large majority of their riding time in the aerobic heart-rate zone that improves cardiovascular fitness, working, but not straining.

That last point matters for eBikes specifically. The worry that assistance means you’re not getting a workout doesn’t hold up: assisted riders stay in the cardio zone for most of the ride, because the motor smooths out the spikes, steep hills, hard starts, rather than removing the effort.

The mental-health evidence is as strong as the physical. A 2024 University of Edinburgh study, published in the International Journal of Epidemiology, analysed nearly 380,000 commuters and found that those who cycled to work were noticeably less likely to be prescribed antidepressants or anti-anxiety medication, 9% of cyclists had such a prescription over the following five years, against 14% of non-cyclists, an estimated 15% reduction. Because of how the study was designed, the researchers describe the link as causal, not just correlation.

The reasons are physiological. Fifteen to twenty minutes of steady pedalling helps flush cortisol, the stress hormone, and replaces it with endorphins and serotonin. The rhythmic, repetitive motion works as a kind of active meditation, interrupting the looping, ruminating thoughts that drive anxiety. And riding outdoors in morning light helps regulate your body clock, which improves sleep, which underpins mental health more broadly.

There’s a quiet irony in it: for a lot of people the commute is the most stressful part of the day, and turning it into a ride flips that on its head, the trip becomes the part that lowers stress rather than adding to it.

The best exercise is the one you keep doing. Most of the studies above measured commuters, not weekend warriors, because a daily ride built into a trip you were making anyway is far more sustainable than a gym habit you have to schedule, travel to and defend against a busy week.

This is exactly where an eBike earns its place. The assistance removes the things that stop people cycling to work, arriving sweaty, dreading the hills, the long slog home after a tiring day, while you still pedal the whole way and stay in the cardio zone. You get most of the health return without the barriers, and you keep doing it. On the days you want a harder workout, drop the assist and burn closer to push-bike numbers; on the days you just want to arrive fresh, turn it up. The exercise scales to how you feel, which is a large part of why people stick with it.