Lying Knee Flexion And Extension On Exercise Ball
Lying Knee Flexion And Extension On Exercise Ball Exercise Description
Lying Knee Flexion and Extension on an Exercise Ball (often called a stability ball leg curl) trains the posterior chain by combining a supine hip bridge with dynamic knee flexion and controlled extension. The hamstrings (biceps femoris, semitendinosus, semimembranosus) are the prime movers as the knees flex; the gluteus maximus maintains hip extension; the gastrocnemius assists; and the trunk musculature stabilizes the lumbopelvic region in a neutral position. The ball’s instability increases the demand for pelvic control, even pressure through both heels, and symmetrical hip height, encouraging precise alignment throughout the movement. The pattern is a straight‑line bridge from shoulders to knees/heels, then a smooth roll‑in (knee flexion) and roll‑out (knee extension) without losing a neutral spine or letting the hips drop.
- Muscle Groups: Hamstrings
- Target Muscles: Biceps Femoris - Long Head, Semimembranosus, Semitendinosus
- Assisting Muscles: Gastrocnemius - Medial Head
- Stabilizing Muscles: External Obliques, Gluteus Maximus, Multifidus, Rectus Abdominis, Transversus Abdominis
- Body Area: Lower Body
- Body Parts: Legs, Upper Legs
- Body Surface: Back
- Body Symmetry: Bilateral
- Equipment: Stability Ball
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Hip Extensors, Knee Flexors
- Joint Involvement: Multi-joint
- Muscle Location: Inner Hamstring, Outer Hamstring
- Movement Direction: Other
- Muscle Position: Posterior
- Gender: Female
How To Do The Lying Knee Flexion And Extension On Exercise Ball Exercise
‘- Lie supine with arms at 30–45 degrees from your torso, palms down.
– Place heels on top of the ball, feet hip‑width, legs nearly straight; lightly dorsiflex the ankles to secure contact.
– Set ribcage over pelvis, brace the abdominal wall, and maintain a neutral spine and neck.
– Drive through your heels to lift the hips until shoulders, hips, and knees form a straight line.
– Keep hips level; gently squeeze the glutes to hold hip extension.
– Without letting the hips sag, flex the knees to roll the ball toward your glutes until shins approach vertical under the knees.
– Pause briefly while maintaining a neutral pelvis and even heel pressure.
– Extend the knees to roll the ball back to the start, moving slowly and keeping hips elevated and torso rigid.
– Breathe continuously; avoid breath‑holding that disrupts trunk control.
– When finished, lower the hips under control.
– Avoid pushing through the toes, excessive lumbar arching, knees collapsing inward, or the ball drifting side‑to‑side.
Lying Knee Flexion And Extension On Exercise Ball Tips
‘- Position your arms 30–45 degrees from your torso with palms down to help stabilize your upper body.
– Place your heels hip‑width on top of the ball with legs nearly straight and ankles lightly dorsiflexed to secure contact.
– Stack your ribcage over your pelvis, brace your abdominal wall, and keep your spine and neck neutral.
– Drive through your heels to lift your hips until your shoulders, hips, and knees form a straight line.
– Keep hips level and gently squeeze your glutes to maintain hip extension during the entire movement.
– As you roll the ball in, flex your knees without letting your hips sag, stopping when your shins approach vertical.
– Maintain a neutral pelvis and even pressure through both heels at the end of the curl.
– Roll the ball back out slowly by extending your knees, keeping your hips elevated and your torso rigid.
– Breathe continuously throughout the exercise and avoid holding your breath so trunk control stays consistent.
– Lower your hips under control at the end, avoiding pushing through the toes, excessive lumbar arching, knees collapsing inward, or the ball drifting side‑to‑side.
Lying Knee Flexion And Extension On Exercise Ball Beginner Introduction
Lying Knee Flexion and Extension on an Exercise Ball is a back‑lying bridge variation performed with the feet on a large inflatable ball. The movement blends lifting the hips into a long line with bending and straightening the knees while the ball rolls underneath the legs. This creates a flowing, back‑and‑forth action that challenges balance and coordination rather than relying on heavy resistance. The exercise emphasizes the hamstrings as the main workers, with strong help from the glutes and calves, while the core supports the hips and lower back.
Because the ball is unstable, the exercise highlights steady hip height, equal effort through both legs, and a quiet, steady torso. The head, ribcage, and pelvis remain organized as the legs move, encouraging even alignment rather than big, explosive motion. The controlled tempo of curling the ball in and sending it back out promotes smooth, deliberate movement, helping beginners build body awareness and lower‑body control in a lying position.