Undated -- Heading to a lake on a hot summer day is a great way to cool off and stay in shape. But you can also easily hurt yourself.
People who've tried water skiing admit t hat it takes a lot of energy to hold onto a tow rope, and that burns calories. It's estimated that a 150 pound man can burn more than 400 calories an hour water skiing.
Doctors suggest pregnant women and people with pre-existing conditions, such as back injuries or bad knees should avoid the sport, because its very easy to get hurt.
