Circuit resistance training is a great way to burn fat and build muscle. The training in this workout is designed to get your heart pumping while at the same time toning and defining muscles. Resistance training is a great way to rev up your metabolism and keep it going, even at rest. Note: This workout is designed for the gym or home gym. Equipment Needed: One set of Dumbbells of medium weight (optional barbell for squats); leg press machine; leg extension machine; leg curl machine; flat bench or step approximately 12? to 16?, for step-ups. What to Do: All fitness levels perform 12 repetitions of each move; rest 15 seconds after each move; rest one minute after each circuit. View video demonstrations below for correct form. From: http://skinnyms.com/killer-legs-and-butt-workout/