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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!
Fitness experts reveal 15 small changes that make a big difference.
Experts Reveal: 15 Workout Upgrades for Better Results