Straight Hip Single Leg Curl On Stability Ball
Straight Hip Single Leg Curl On Stability Ball Exercise Description
The Straight Hip Single Leg Curl on a stability ball is a posterior-chain exercise emphasizing the hamstrings while the hips remain extended. You’ll maintain a neutral spine and level pelvis as one heel drives into the ball to curl it toward you, creating high hamstring demand with added core stabilization from the unstable surface. Primary movers are the hamstrings (biceps femoris, semitendinosus, semimembranosus); the gluteus maximus assists in maintaining hip extension, while the abdominals and obliques resist pelvic tilt and rotation. The calf (gastrocnemius) contributes to knee flexion, and the gluteus medius helps keep the pelvis level on the single-leg stance. This variation trains coordinated hip extension with knee flexion—useful for strengthening the posterior thigh and improving single-leg control without loading the spine.
- Muscle Groups: Hamstrings
- Target Muscles: Biceps Femoris - Long Head, Semimembranosus, Semitendinosus
- Assisting Muscles: Gastrocnemius - Medial Head
- Stabilizing Muscles: External Obliques, Gluteus Maximus, Gluteus Medius, Internal Obliques, Rectus Abdominis
- Body Area: Lower Body
- Body Parts: Legs, Upper Legs
- Body Surface: Back
- Body Symmetry: Unilateral
- Equipment: Stability Ball
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Hip Extensors, Knee Flexors
- Joint Involvement: Single-joint
- Muscle Location: Inner Hamstring, Outer Hamstring
- Movement Direction: Other
- Muscle Position: Posterior
- Gender: Male
How To Do The Straight Hip Single Leg Curl On Stability Ball Exercise
‘- Lie supine with arms at about 45° from your torso, palms down.
– Place one heel centered on top of the ball; dorsiflex the ankle (toes up). Lift the other leg straight, in line with your thighs.
– Brace your core; set ribs down and maintain a neutral spine.
– Press the working heel into the ball and lift your hips into a straight line from shoulders to working knee; keep the pelvis level.
– Keep the free leg aligned with the torso; avoid letting it drift or drop.
– Without letting the hips sag or rotate, flex the working knee to roll the ball toward your glutes.
– Stop when the working knee reaches roughly 90° of flexion; pause briefly.
– Slowly extend the knee to roll the ball away, maintaining hip extension; avoid locking the knee.
– Keep the knee tracking in line with the hip and toes; don’t let it cave inward or flare out.
– Breathe steadily; exhale as you curl, inhale as you extend.
– Lower hips to the floor only after completing the set, maintaining control.
Straight Hip Single Leg Curl On Stability Ball Tips
‘- Center your working heel on top of the ball and keep your toes pulled up toward your shin.
– Keep your non-working leg straight and in line with your thighs so it doesn’t drift or drop.
– Brace your core, set your ribs down, and maintain a neutral spine throughout the movement.
– As you lift, create a straight line from your shoulders to your working knee and keep your pelvis level.
– Press your heel firmly into the ball to lift your hips before you start curling.
– Curl the ball in without letting your hips sag or rotate.
– Stop the curl when your working knee is around 90° of flexion and hold briefly.
– As you extend the knee, move slowly, keep your hips extended, and avoid locking the knee.
– Keep your working knee tracking in line with your hip and toes; don’t let it cave inward or flare outward.
– Breathe steadily, exhaling as you curl the ball in and inhaling as you extend it out, and only lower your hips after the set is complete.
Straight Hip Single Leg Curl On Stability Ball Beginner Introduction
The Straight Hip Single Leg Curl on a stability ball is a single-leg bridge-style movement that highlights the back of the thigh while the hips stay lifted. Performed on an unstable surface, it blends hamstring work with significant core engagement as the ball glides in and out under one heel. The spine remains long and the pelvis stays level, encouraging controlled motion rather than momentum.
As the working leg bends to pull the ball closer, the hamstrings handle most of the effort, assisted by the glutes and calf. Muscles through the abs and side abs help prevent the lower back from arching or twisting, while the muscles around the outer hip support balance on a single leg. Because the hips remain extended while the knee bends and straightens, this variation reinforces coordination between hip and knee action, building strength along the back of the leg and improving body awareness in a single-leg position, all without extra load on the spine.