I love to swim, I go to the lake all the time when I can, Do you know anything about swimming? 
It's a rather low-impact exercise activity compared to running or lifting weights, and it's used often in physical rehab because of that.
Oh yes I have heard of that, Doesnt swimming give you more excersize though? How many calories do you burn?
It is great exercise, and it's quite a popular recreational activity too. Generally if you swim for an hour (not just leisurely but seriously) you can burn about 600 calories.