What activities raise fitness skill but do not make you more muscular or thinner?
Looking for various ways to increase fitness skill but not become more muscular or thinner. Just in case I missed any I'm not aware of (basketball shooting I believe does not change your muscle/weigh...
Now that I remember, it's a good idea to use a treadmill or jog to level fitness before swimming. Jogging or the treadmill won't increase muscle, but it will reduce weight.