Muscle Building: Isolation Exercise - Leg Extensions

Your target zone are your thighs (Quadriceps). Sit on a leg extension machine and place the tops of your feet under the foot pads. With your lower back firmly against the seat, slowly lift your lower legs until your knee joint reach the locked position. Pause for a contraction, then slowly return to the starting position. Leg extensions, ideal for isolating the quads, are an effective warm up for the squats that follow.