I am a runner, and I do train for running by running. But I mean if I want to perform in a race I don't just practice racing, I practice running at different tempos for different lengths of time, and do a lot of warming up, warming down, and stretching.

I know you can do wonderful things to your body through stretching and exercises, and solve issues not only with running, but also with hands and arms and things related to musical instrument playing.

I know less about voice training though as I never had any problem until recently with doing exactly what I wanted to do so never bothered learning.