A lunge is a lower-body exercise that works your quads, glutes, hamstrings and calves. To do a lunge with a barbell, follow these steps:
Stand with your feet shoulder-width apart and a barbell resting on your upper back. Hold the barbell with your hands slightly wider than your shoulders and your elbows pointing down.
Step forward with your right foot and lower your body until your right thigh is parallel to the floor and your left knee is almost touching the ground. Keep your torso upright and your core engaged.
Push through your right heel and return to the starting position. Repeat with your left foot and alternate legs for the desired number of reps.