If you don't want to exercise your muscles, reduce the amount of exercise. Treadmill and spinning bike both exercise muscle groups, especially spinning bike, which has a good weight loss effect. Every time you finish exercise, you must stretch well, so that you can shape your muscles and make them longer, so that they will not be uneven and so strong. If you want to get in shape but don't want to grow muscles, you can try Latin dance, jazz dance and ballet.