Try on a pair of Reebok EasyTones ($100) - wearing them is like walking on wee pillows of happiness. There is a small, round pocket of air below the heel and ball of the foot. The pockets function similarly to balance balls and not only make the shoes incredibly comfortable, but also make the muscles in your bum and calves work harder. You're essentially wearing a special mini-gym on each foot. Obviously these aren't magic shoes that lead to instant weight-loss and a slamming body just by strolling down the street, but getting a little extra workout in your butt and legs while you're doing errands or dashing to the metro is pretty fab.
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