Hi I'm Dallas. I'm new so please forgive any mistakes I make here, but I've got a question. I've been struggling with weight loss for a long while now. I'm 17, 240 lbs, 5'8, pretty muscle heavy. I want to lose weight and tone muscle, so I got a pool. My joints are pretty sucky so I thought low impact exersices would be good. I've been swimming my whole life, and today I swam, leisurely, for about two and a half hours, and when I plugged it into my calorie tracker, it said I burned anywhere from 1000, to 1800 calories. Is this right? It feels like I didn't even exersise, so I can't believe I burned that many. Thank you for your help!!