From MBTs to Skechers Shape Ups, there are plenty of toning shoes shaped like sneakers. A few years ago FitFlops, the exercise flip-flop, debuted and the company has been rolling out all sorts of fitness-y shoes ever since. For Fall, you can cover your tootsies and tone your backside, according to FitFlips marketing copy, with the Mukluk ($140).You can walk about on the "muscle-loading FitFlop Micro-wobbleboard midsole" wearing breathable shearling booties. Would you drop that kind of dough for a pair of toning shoes? Or would you rather spend the $140 on series of yoga classes or a couple of sessions with a personal trainer?