It doesn't take hours in the gym to get fit. In fact, you can build muscle and burn fat in less time by tweaking your usual weight-lifting routine into a circuit. Creators of the "Supreme 90 Day" system John Dull and Michele Collier recommend doing a total-body resistance workout by moving from exercise to exercise with minimal rest between sets and exercises. This combines your strength and cardio workout into one!
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Fitness experts reveal 15 small changes that make a big difference.
Experts Reveal: 15 Workout Upgrades for Better Results