Hurry up and ‘weight’! Designed in Japan, these shoes are ‘heavy’ hitters in the world of physique-bettering sneaks. At about 3 lbs. each (due to several small metal spheres within the sole), they’re three to four times the weight of standard sneakers—which means walking in them for just 30 minutes can burn up to 300 calories. Even if you’re simply traipsing around tackling your daily to-do list, you’re ‘pound’ to notice firmer legs and improved muscle tone over time. With a Velcro-closure front strap, and an extra-thick sole and tongue to reduce the impact on feet and ankles. White. U.S. women’s whole sizes 7-11. (Half sizes order up.)