One day, as Sheffield was in the middle of leg curls, his cellphone rang.

Watch your back when it comes to lying leg curls.

But Bischof said leg curls can be done at home by lying face down on a bed with knees just off the edge and legs extended.

Across the room, Mr. McCarthy groaned as he performed a series of leg curls.

His workouts, with consultation from a physical therapist at the university, focus on leg curls and leg extensions.

Especially stressful, the orthopedist said, are leg curls.

I started with leg extensions and leg curls, muscles burning as I worked.

-Perform leg curls, leg extensions and upper body building.

The most effective way of isolating the leg biceps is by using a hamstring machine to perform leg curls.

He was doing leg curls, facedown on the bench next to mine, his attention turned inward.