Its pretty simple, if you want to ride like a roadie then train with roadies. Bodyweight exercises dont put on the muscle like heavy weights do so pushups etc are fine. You also dont need to waste money going to a gym (unless your using it for pick'n up) as bodyweight exercises can be done in the elevator, bus, car, bike etc on the way to work or whilst watching TDF re-runs etc.
NEVER focus on getting lighter, focus on building health and fitness and as a result, our body will adapt. Otherwise its like doing a road race and focusing on being first wheel the whole race and wondering why we get dropped when the real race starts.