Stability Ball Leg Curl
- Intermediate
- Stability ball
The stability ball leg curl combines a bridge with knee flexion. You lie on your back with your lower legs and heels on the ball, press your hips up until the body forms a line from shoulders to heels, then pull the ball toward your hips by bending your knees, letting the hips rise further as the heels arrive. The hamstrings work at both ends, flexing the knee while helping the glutes hold the hips extended, and the ball adds a balance demand a floor version does not have.
How to do the Stability Ball Leg Curl
- Lie on your back with your lower legs and heels resting on a stability ball.
- Place your arms out to your sides, palms down, and brace your midsection.
- Press your hips up until your body forms a line from shoulders to heels.
- Bend your knees and pull the ball toward your hips, keeping the hips high.
- Pause when your heels are near your glutes and your shins are close to vertical.
- Roll the ball back out under control without letting the hips drop, then repeat.
Muscles worked
- Primary:
- Hamstrings
- Secondary:
- Glutes, Calves, and Core
Why train it
- Trains knee flexion and hip extension inside the same repetition.
- The unstable ball adds a pelvic control demand a machine curl cannot.
- Scales easily by narrowing the feet or lifting one leg off the ball.
Common mistakes
- Letting the hips sag as the ball rolls in, which hands the work to the hip flexors.
- Rushing the return, which is where the hamstrings take most of their eccentric load.
- Pushing through the toes instead of the heels, which turns the ball into calf work.
- Letting the ball wander side to side, so balance rather than the hamstrings ends the set.
Frequently asked questions
What muscles does the Stability Ball Leg Curl work?
The Stability Ball Leg Curl trains the hamstrings as the main target. Expect the glutes, calves, and core to take some of the load as well.
What equipment do I need for the Stability Ball Leg Curl?
Only a stability ball. Nothing beyond that is required to run the movement the way it is described above.
Is the Stability Ball Leg Curl suitable for beginners?
With some training behind you. The Stability Ball Leg Curl is rated intermediate, which means the setup matters as much as the effort. It is a reasonable first month goal rather than a first session one, and the alternatives below are the easier way in.
Can I do the Stability Ball Leg Curl at home?
Yes, if you own a stability ball. That is the whole requirement, and it is the reason this one travels well between a home setup and a gym floor.
How many sets and reps of the Stability Ball Leg Curl should I do?
Three to four sets of 10 to 15 reps. Isolation work responds to reps and a controlled tempo rather than load, so stop each set a rep or two short of failure and keep the weight honest.
What are good alternatives to the Stability Ball Leg Curl?
Hamstring Curl, Band Leg Curl, and Cable Single Leg Laying Leg Curl train the same primary muscles as the Stability Ball Leg Curl. Pick whichever one matches the equipment in front of you.