The lying cable leg curl is a classic machine exercise for building greater muscle size and strength in the hamstrings. It's easy to learn, easy to master, and poses little in the way of injury risk. It is usually performed for moderate to high reps, at least 8-12 reps per set, as part of lower-body training.
Builds stronger, more muscular hamstrings
Easy to change the weight for dropsets
Great for emphasizing the negative portion of reps or for adding pauses