Group Training Specialist Free Exam Prep

Answer: C - Lunges, squats, leg presses, and cycling are all examples of working in a “closed” chain. In open chain exercises, the terminal end of the chain (your hand or foot) is free to move. These types of movements isolate a single muscle group and a single joint. Consider the knee extension exercise. The one joint involved during a leg extension is the knee and the muscle group it isolates is the quadriceps. In contrast, in a closed chain, the terminal end of the chain is in contact with a stable surface, like during a leg press or squat.