Side Plank Clamshell
Side Plank Clamshell Exercise Description
The Side Plank Clamshell blends a side‑plank from the knees with a clamshell hip opening. It targets the lateral hip abductors and external rotators—primarily the gluteus medius and portions of the gluteus maximus—while the obliques and shoulder stabilizers maintain trunk and shoulder alignment. This combination challenges pelvic control and hip strength as you resist rotation and keep a neutral spine. Because the hips are lifted in a side plank, the top leg’s external rotation happens against a stable pelvis, promoting clean movement mechanics. Performed with body weight only, it’s a compact drill to train lateral hip strength and whole‑side stability without equipment.
- Muscle Groups: Glutes, Hips
- Target Muscles: Gluteus Maximus, Gluteus Medius
- Assisting Muscles: Gemellus Superior, Obturator Internus, Piriformis, Quadratus Femoris
- Stabilizing Muscles: External Obliques, Internal Obliques, Quadratus Lumborum, Serratus Anterior, Trapezius - Lower Fibers
- Body Area: Lower Body
- Body Parts: Hips, Legs, Upper Legs
- Body Surface: Back, Side
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Hip Abductors, Hip Extensors
- Joint Involvement: Single-joint
- Muscle Location: Glutes, Upper Glutes
- Movement Direction: Rotational
- Muscle Position: Lateral, Posterior
- Gender: Male
How To Do The Side Plank Clamshell Exercise
‘- Lie on your side with knees bent about 90°, heels in line with hips, feet together. Place your bottom forearm on the floor with the elbow directly under the shoulder.
– Stack shoulders and hips; set a long neutral spine and keep the neck in line with the torso.
– Press the forearm and bottom knee/shin into the floor to lift hips into a side plank from the knees. Keep a straight line from head to knees.
– Maintain stacked hips (no rolling back). Rib cage down; avoid flaring. Shoulder stays away from the ear.
– Keeping feet together, externally rotate the top hip to lift the top knee like a clamshell. Lead with the knee; avoid letting the pelvis tip.
– Pause briefly at the top while keeping hips lifted, then close the knee with control.
– Breathe steadily—exhale as the knee opens, inhale as it returns—without losing spinal or pelvic alignment.
– Common form checks: don’t let hips sag or pike, don’t separate the feet, and don’t twist the torso.
Side Plank Clamshell Tips
‘- Start on your side with knees bent about 90°, heels in line with hips, and feet together.
– Place your bottom elbow directly under your shoulder with the forearm on the floor.
– Stack your shoulders and hips, keeping a long neutral spine and neck in line with your torso.
– As you lift into the side plank, press through the forearm and bottom knee/shin and keep a straight line from head to knees.
– Maintain stacked hips as you hold the plank; avoid rolling the top hip backward.
– Keep the rib cage down and the working shoulder away from your ear.
– When opening into the clamshell, keep feet together and lead the movement with the top knee.
– Avoid letting the pelvis tip or shift as the top knee lifts.
– Pause briefly at the top with hips still lifted, then close the knee with control.
– Breathe steadily—exhale as the knee opens and inhale as it returns—without losing spinal or pelvic alignment.
Side Plank Clamshell Beginner Introduction
The Side Plank Clamshell is a bodyweight floor exercise that links a supported side plank on bent knees with a clamshell-style opening of the top leg. The lower forearm and leg act as the base, raising the hips so the body lines up from head to knees. From this lifted position, the upper knee turns outward and rises while the feet remain together, then returns with steady control, creating a smooth, repeated hip-opening motion.
This combination places strong emphasis on the outer hips and glutes of the top leg, while the side abs and shoulders on the bottom side contribute to holding the torso steady. With the hips elevated, the rotating leg moves against a firm, unmoving base, encouraging precise motion at the hip joint rather than through the lower back. The movement theme centers on side-to-side steadiness and refined control, as the body resists sagging, lifting, or twisting, making it a compact option for training strength and stability along one entire side of the body.