Unlike most toning shoes, which have rounded bottoms or balance pods, these sneakers are built with weighted soles. Since you’re schlepping up to 2 pounds more per shoe, you’ll burn more calories when walking in them. These shoes are about as safe as strapping on a pair of ankle weights, says Jacqueline Sutera, DPM, a spokesperson for the American Podiatric Medical Association. Which is to say, they’re safe for walking in occasionally, but shouldn’t be used for dancing or moving side-to-side. The extra weight can increase risk of a twisted ankle if you’re moving laterally.