45 seconds (as fast as you can) on- 30 second off (rest) for 20 mins
Using a flat bench and place a dumbbell on each side of it. Place the right leg on top...
Place the left foot on the box. Step on the box by extending the hip and the knee of...
Here's a killer combo. For those who have a hard time, squatting with a barbell. You can use dumbbells....
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