A short but intense full body workout with plyometrics to do on busy days. This dumbbell workout/cardio routine is for experienced exercisers who want to get a total body workout and boost their metabolism in just 15 minutes. For best results select a set of weights that challenge you. Resistance training boosts your metabolism and allows you to build muscle as you burn fat, increases your bone density to decrease the risk of diseases like osteoporosis, and improves your sleeping habits and overall mood.