Swimming may not be able to lose weight, because I have tried. My eyes are still red after swimming. When I got home, my leg ached badly the next day. I can eat especially after swimming, and I eat more than usual, so I think the most effective thing is walking. No kidding! Yes, 12 minute freestyle can consume 836KJ of calories and 836KJ of exercise every day. If you do it three times a week, you can get rid of stay away from obesity's troubles. Swimming with short time and high calorie consumption is the best choice to save time. Similarly, swimming, freestyle exercise is relatively large, and it only takes 12 minutes to consume a lot of calories. Try it quickly! Don't eat too much before going into the water. Be sure to do warm-up exercises first to avoid cramps.