Check out the Mission Craze that is what my 10 yo son is getting for christmas.


Edit if they are serious about it get them some exercise bands and pull up bar for the door frame. My son is a monkey and hung on that bar for several months. Currently he is at 7 true pull ups, which is not easy to do he is trying to catch me so it is a fun workout to do together. The bands are great for developing draw strength.