Beachbody Muscle Burn Mens Training Shoes. Men's BEACHBODY® Muscle Burn. The Muscle Burn is a breathable, supportive shoe built with a technical open mesh upper and a rubber skeletal outsole. These fitness shoes provide comfort, durability and support. The Muscle Burn features a mid-foot strap to secure fit, and a flat, wide base platform to provide essential close-to-the-ground feel during a strength-based workouts such as lifting weights.