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NO. Leg extensions and leg curls are not going to build mass, and I don't think it's safe to go really heavy on either, especially on legextensions. You would have to be going really heavy on these to reach failure at 6-10 reps, and you'll just be straining your knees.Originally Posted by SNEAKERKING757
I know that for mass, you should lift heavy in a rep range of 6-10...
Does this apply to legs as well?
The exercises I'm referring to specifically are legs extensions and leg curls.
In all honesty, your legs need a little more in terms of reps and volume than your other large muscle groups. It varies from person to person, but most ofyour sets for legs should be between 8-15 reps with a last set of 6-8 for squats, leg presses, and romanian deadlifts. I typically use leg extensions as awarmup for about 3 sets of 20 reps, and then sometimes again as a finisher with leg curls for 3 sets of 15 to 20 of each.