Suspension Training Single Leg Lunge Exercise. This video provides a basic exercise information with use of the suspension training leg exercises. The exercise above is an advanced leg strengthening exercise that primary focuses on balance development, working muscles that you you keep stabilised whilst exercising. The exercise will help strengthen quads, hamstrings, calf and knee ligaments. This exercise would be ideal for hockey, football and rugby players, looking to increase strength and stability on leg muscles individually.