I may sound completely stupid here, but how actually good is swimming for you, wieght loss wise?? I swim about four times a week, doing maybe 25 - 30 25 metre lengths and have started also really working out properly (x trainer, arm, leg and tummy machines) in the gym three times. What I need to do is get my flabby tummy sorted and rebuild muscle in my arms and legs. I also cycle 4 miles a day to work and back. Realistically, is this enough exercise to lose maybe a stone? I'm 5'5 and weigh 9'11 but fell I need to be about 9.