Well, assuming you mean the proportionately weakest muscle in the chain, certainly. If a part of your body can't keep up with the movement, train it until it can!
I think I read an article somewhere though about how in endurance sports, it's possible to achieve similar results while restricting yourself to smaller muscle groups, since your body will adapt and make your muscles bigger.
I believe the article specifically mentioned rowers, and the author got an e-mail from a coach asking for advice. The author was shocked to see how big the rowers were, until he realized that their particular boat rowing sport didn't allow lower body movement to assist in the rowing motion or something like that.
I think I read an article somewhere though about how in endurance sports, it's possible to achieve similar results while restricting yourself to smaller muscle groups, since your body will adapt and make your muscles bigger.
I believe the article specifically mentioned rowers, and the author got an e-mail from a coach asking for advice. The author was shocked to see how big the rowers were, until he realized that their particular boat rowing sport didn't allow lower body movement to assist in the rowing motion or something like that.