Swimming is really good exercise in terms of toning your body all over - and it doesn't put stress on the joints. At my weight, I'd burn 475-700 calories an hour swimming. I like to do the breast stroke, because I can swim for a longer time doing it (and it's great for toning the inner thighs) that's at the lower end of the calorie burning. I usually do about 10 laps of breast stroke at an easy pace, then do a lap or two of fast crawl, and then back to breast stroke.
Age 61, Height 5'9"
March 2010 145 lbs, Jan 2013 173 lbs
1st Goal 145 lbs 5/25
New goal 140