It all started with MBT, then Sketchers introduced the Shape-ups, and after that, I feel like I lost count of all the toning shoes being introduced to the fitness world. When the American Council on Exercise (ACE) investigated the fitness claims associated with these types of shoes, they found that "none of the toning shoes showed statistically significant increases in either exercise response or muscle activation." While some people love them; others feel they are just another pair of sneaks. Have you tried out a pair of these toning shoes pictured below? What was your experience?