Training with Ava Cowan - Giant Set Leg Workout - Leg Extensions, Walking Lungs & Bench Jumps. This is a great workout for those that are rushed for time, & it burns a lot of calories, great for if you are trying to lose weight. The Leg Extensions target the quads, the Lunges hit the glutes. Remember to connect the mind with the muscle for maximum effectiveness. With the Walking Lunge take a nice wide stride. For perfect posture, keep the chin up, chest up. Finish with the Bench Jumps. Ava Cowan - Gaspari Nutrition athlete with Nick Jones - World Bodybuilding Champion.