You don't always have to jump around doing cardio to burn major calories. Strength training builds metabolism-boosting muscle and burns even more calories after your workout as your body recovers and repairs itself. This workout from trainer Autumn Calabrese builds on this principal by adding isometric holds to strength-training moves. And it's challenging but still. So grab a pair of weights and come by ready to build muscles in a whole fresh way (without disturbing your downstairs neighbors).
On Anna: Eden Activewear tights & sports bra
On Autumn: Lorna Jane tank
Source: popsugar.com