How can you build up your legs?

Alternate...: When building up your legs, make sure to focus on alternating muscle groups. For example, do one set of "pushing", then one set of "pulling." examples of each: pushing = squats, pulling = supine leg curls. See a trainer for specifics, but a common mistake is focusing entirely on squats or presses, and neglecting the hamstrings and calf muscles.

Leg Muscle: To build up your leg muscles you need to do progressive resistance exercises. That means 4 sets with the next set increasing the weights. Leg presses, squats, leg curls, knee extensions and calf raises. Twice a week should suffice. Your legs should be fatigued after your workout if you push it enough. You also need to make sure you get enough protein, at least 1 gram per pound.