2. Fire Hydrants
Move your body onto all fours. Your back should remain flat, so be careful not to arch it. Still kneeling, raise you left leg. Hold for a beat, then return to its original position. Do a set of 15, then switch legs. For extra difficulty, instead of returning your leg to its original position, pulse it for 30 beats before switching legs. There’s a reason this is one of our favorite thigh exercises!