Time: Nine minutes
Start with dumbbells resting at your hips. Lunge forward with your right foot, touching your left knee to the ground. Step immediately into the next lunge, left foot forward and right knee down, so you're walking. Keep your torso upright and your stomach tight.
Do: six sets of five reps per leg (ten steps total per set). Increase weight after each set so the final one is difficult but doable.
Between sets: FLOOR ANGEL—Lie on your side with your bottom leg straight and your top thigh perpendicular to your body, knee at 90 degrees. Extend your arms, fingertips touching. Sweep the top hand upward like a windshield wiper, following it with your eyes, until the bent knee lifts off the ground. Hold five to ten seconds. Return to starting position, and repeat on other side.