On the kickbike: Some of the very accurate concerns expressed on here.....balance, hamstring strength, and static isometric exercises for the crouching legs, are all addressed by the kickbike. I also find it a great cross-training aerobic conditioner.....bike one day, climb a 1700' two-mile hill with a thirty pound pack the second, kickbike the third..... Kickbikes are relatively cheap, easy to maintain and store.... and I'll guarantee you that you will be an instant, smash hit when kickbiking past an elementary school! Little kids go absolutely nuts over it!