The leg curl is a popular machine-based exercise for the legs, particularly the hamstrings. It comes in seated and lying varieties, but the seated leg curl machine is more common in commercial gyms. Leg curl variations are usually performed for moderate to high reps, such as 8-12 reps per set or more, as part of a leg pre-exhaust or as a muscle-building movement for lower-body training.
Builds size and strength in the hamstrings
Less glute and hamstring involvement than lying curl variations
Great accessory movement for a stronger squat and deadlift