Move a little further outside the box with some high intensity interval training - this time focused on the shoulders and core. Power though a fast-paced sequence of dynamic strength drills like plank to side plank, forearm plank to high plank walks, and dandasana to reverse table top lifts. You'll work your way toward your limit, then cool down the burn with some soothing chest and shoulder stretches. Props Needed: A block and a strap.