Originally Posted by
Albatrosspro
Essentially, I'm aware of what Myosmith said about Navy Seals and pro cyclists, but I'm wondering how exactly they do both at once.
They don't. Why do you want to build muscle mass? If that is your primary goal, why do you care about cycling?
If your focus is on making your legs bigger then strength training is the way to go. If you don't want to interfere with the strength training but you still want to ride just ride easy.