Our group’s original design intensions were to design something which engages both parents and their children while giving both an incentive to work-out. The final product which we developed was a water squirting cart. This cart is powered and driven by an adult, where the main power input is analogous to that of a bicycle. The child is on the back of the cart, using his arms to pump up air pressure in a water tank. This water tank is directly hooked up to a water cannon (aimed by the child). Many of these carts will exist in a driving range which the parents drive around and the children try to squirt each other with water.
We believe this is a good product since the child will probably become very engaged into the game and his enthusiasm will pressure the parent to also work out harder.