... 2, Safe and stable 3, 2012 new design 4, High quality Merry Rider 1. ... : Exercise the muscles of upper limbs, waist ,legs and back.Function three: Build a healthy heart and lungs. 5 ... not exercise too hard. If you used to take part in sports activities, you can increase amount of exercise ... who are suffering hypertension and heart disease should take a walk for 10 minutes.Four, master the motion time. ...