Does cycling build leg muscle?

Cycling builds some leg muscle, but not much. It's great for endurance in your quads, glutes and calves, and a beginner can add a little size in the first few months. After that, riding alone won't grow your legs the way lifting does.

Why it's limited

Muscle grows when it's pushed close to its limit with a heavy enough load. Riding at a steady pace uses low force over a long time. That trains the muscle to keep going, not to get bigger.

You can see this in road cyclists. Many have strong, lean legs but not big ones. Track sprinters, who push very high forces in short bursts, have much larger quads.

What helps legs grow on a bike

If you want to get more out of your riding, make it harder in force rather than longer:

• Seated climbs at a low cadence, around 50 to 60 rpm, in a big gear
• Short all-out sprints of 10 to 20 seconds with full rest
• Hill repeats, grinding up for 2 to 4 minutes

These help, but the effect is modest. They're mostly good for cycling-specific strength.

If you want bigger legs

Lift. Squats, lunges, leg press and Romanian deadlifts will do far more than extra hours on the bike. Two sessions a week is plenty alongside your riding.

Lifting also makes you faster on the bike, since stronger legs push the pedals with less effort. Plenty of cyclists skip it because they think they'll get heavy or slow. In practice, two moderate sessions a week won't bulk you up, and the gain in power is worth it.

Can you do both

Yes. The only real tension is fatigue. A hard ride followed by heavy squats the next morning won't feel good. Try to put your leg day and your hardest ride on different days, or at least separate them by a few hours. There's more on that in does cardio kill gains.

Rides and lifting sessions both sync from Apple Health into League of Fitness, so hill repeat days and squat days each count toward your daily match. That makes it harder to let the leg day quietly disappear.

If you only ride, expect fitter legs and stronger endurance, not much size. That's a good trade for most people.