This exercise is an advanced variation of the traditional walking lunge in that it places greater tension throughout your lower body and core, accelerating muscle strength and definition.
Standing tall with your feet shoulder-width apart, hold a barbell across your shoulder blades. Take a large step forward with one leg and drop your hips into a lunge, bending both knees to 90 degrees. Keep your chest up and your shoulders back.
Step forward with your back leg to bring your feet together. Repeat the motion with your opposite leg, moving forward.
Take a large enough step for both of your knees to bend to 90 degrees.
Keep your back flat during the exercise to avoid injury.
Center your weight in the heel of your front foot.