I grew up wrestling and for the most part, you could get seriously conditioned physically from wrestling alone however I found the external rotators of the shoulder would NEED to be trained year round even through the season to counteract all the internal rotation work from the practices and competitions.
Another example directly from Charles would be alpine skiers who need to do a TON of hamstring work to counteract the overuse of the quads in their sport.
If we were to look into sprinting. If all you did was sprint (track, hill or on sand), would there be any particular imbalances that would naturally occur if you practiced sprinting excessively?