Healthacker.com

This grandmother, at 54, is a champion water-skier and in great shape:
She saw water skiing as a way to stay physically fit. And she loves the feeling of slicing through the water on the edge of her ski.
In trick skiing, some of the tricks are done while holding the tow handle with the hands; other [...]

2nd Wind Fitness points out that caffeine has a negative overall impact, though it does give you an immediate boost.
Tear.