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Turn your body into a fat-burning machine with this circuit.
We dare you to attempt six rounds without stopping.
The key to do both? Timing, a new study says.
Try this three-pronged attack to maximize your abilities.
This upper-body muscle-burner is the ultimate quick-hit circuit.
Are you making one or more of these core-training mistakes?
Use a Swiss ball and a set of dumbbells.
Get guns that amaze with these four mass-multiplying moves.