[anew]

This is true. However I find most guys at the gym rarely do squats, lunges or leg presses. They tend to focus on their glamour muscles and foolishly ignore the rest of their body.

[scott_s]

This is also true. But I do squats, cleans and deadlifts [1], and most cyclist have much more defined, and often bigger, legs than me.

[1] Well, I used to. These days I don't do much heavy strength training, and mostly do conditioning as a part of Brazilian Jiu-Jitsu practice.

[jules]

When a cyclist trains he is doing 2+ hours of constant hard leg exercise. It's not a surprise that he has bigger leg muscles.

[scott_s]

Yes, I know. I provided another example to support ellyagg's point.