What: Fitflops, $49
Why: We've already told you about Earth Sandals and their fancy Negative Heel Technology that makes you work while you walk. Well, apparently a trend has emerged and flip-flops are starting to rise to the occasion. Fitflops is a new line of footwear that claims to give your calves, glutes, thighs, and hamstrings a significant workout all thanks to the elevated midsole. And they are extra shock-absorbent which is great for your back.
I decided to take my pair out for a stroll around the city and ended up walking in them for a good two hours. By the end of my journey, I must admit, my legs were a-burnin'. And I certainly felt some muscle ache in my bum the next morning. Now I doubt wearing these from now on will transform my legs into statuesque, rock-hard gams (um, see above) but if I have a choice when walking out the door, I'll be sure to slip on my Fitflops and look forward to that burn the next day.
Get Yours: macys.com, blissworld.com

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Check out http://www.earthfootwear.com. Built with Kalso Negative Heel Technology, its just like walking on an inclined treadmill. And with tons of calorie-burning and muscle-toning styles to choose from, there is something for everyone. Skip the gym and get a workout doing everyday activities!