Hamstring Hinge Hop
Stand on right leg (knee soft) with hands together at chest and arms bent out to sides. Hinge forward from hips, lowering torso toward floor and extending left leg back until body forms a straight line from shoulders to heel.
Reverse movement (without touching floor), then jump off right leg as high as you can, raising bent left leg up to hip height. That's 1 rep. Without lowering left leg, do 10 reps. Switch sides; repeat, then jog in place for 30 seconds.