ocr: Fillin the missing gerunds. Doing exercise 1S important ifyou want to be healthy. Swimming 1S a - good activity for most people because the water makes it easier to move. Walking 1S also very good andy you don'tneedalot of equipment. Running 1S good exercise, but it can do damage to your knees.Ifyou like music, maybe dancing 1S for you. Games that give you - a chance to move around are also healthy. Playing tennis can be healthy andfun.