Clamshell
Primary
Glutes
Secondary
Hip abductors
Equipment
Bodyweight
Difficulty
Beginner
Type
Rotation
Clamshell
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The clamshell targets the gluteus medius—the muscle on the side of your hip that stabilizes your pelvis during single-leg activities like walking and running. Lying on your side with knees bent, you rotate your top knee upward while keeping feet together. This is essential for hip stability and commonly used in rehabilitation.
When to use it
Use for glute activation, warm-up, or rehabilitation.
Who it's for
All levels. Essential for runners and those with hip issues.
Stack your hips vertically—do not roll backward to lift your knee higher. The range of motion is small and controlled. Focus on feeling the outer glute work rather than lifting as high as possible.
Muscles worked: Clamshell
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Clamshell form guide
- 1
Lie on your side with knees bent at 45 degrees.
- 2
Stack your hips and keep feet together.
- 3
Rest your head on your bottom arm.
- 4
Keeping feet together, rotate your top knee upward.
- 5
Open as far as you can without rotating your pelvis.
- 6
Lower with control and repeat.
What are the best tips for the Clamshell?
Keep your hips stacked - don't roll backward.
Move slowly and with control.
Focus on feeling the outer glute work.
When to Use the Clamshell
Program clamshells for glute medius activation, warm-ups before lower body work, or rehabilitation protocols. Use higher reps with controlled tempo. They pair well with glute bridges and lateral walks for complete glute activation.
What are common Clamshell mistakes to avoid?
Rolling hips backward to lift higher.
A compromised back position during the Clamshell puts your spine under unnecessary shear force. Brace your core and maintain a neutral spine throughout the movement.
Using momentum instead of controlled muscle contraction.
Bouncing or using momentum during the Clamshell takes work away from your Glutes (gluteus medius) and puts your connective tissue at risk. Control the weight through the full range — if you can't, lower the load.
Not controlling the lowering phase.
Rotational exercises like the Clamshell generate force through your midsection. This mistake leaks power and can strain your Glutes (gluteus medius). Move deliberately and own every inch of the rotation.
Is the Clamshell right for you?
All levels. Essential for runners and those with hip issues.
How to Program the Clamshell
Lower reps with heavier weight builds raw strength. Your muscles and nervous system adapt to handle more load over time. This range is best for strength-focused goals.
This rep range keeps your muscles under tension long enough to trigger growth. Most people see the best muscle-building results in this zone. It balances strength and muscle size.
Higher reps with lighter weight builds muscular endurance and improves conditioning. This range is good for joint health and building work capacity.
General guideline: 3 sets of 15-20 reps per side. Rest 30s.
What are good alternatives to the Clamshell?
Fire Hydrant
Side-Lying Hip Abduction
Banded Clamshell
Other Variations
- Banded Clamshell
- Elevated Clamshell
- Reverse Clamshell
Frequently Asked Questions About the Clamshell
The Clamshell primarily targets the Glutes (gluteus medius), making it an effective exercise for glutes development. Secondary muscles worked during the Clamshell include Hip external rotators, providing additional training stimulus. Stabilizer muscles engaged include Core.
Yes, the Clamshell is an excellent choice for beginners due to its straightforward movement pattern and lower technical demands. All levels. Essential for runners and those with hip issues. Start with lighter weights to master proper form before progressing.
For the Clamshell, the recommended approach depends on your goals. 3 sets of 15-20 reps per side. Rest 30s. For strength, use 12-15 reps per side. For muscle growth, perform 15-20 reps per side. For endurance, complete 20-30 reps per side.
Yes, the Clamshell can be done at home with no equipment. It requires minimal space and is a great option for home workouts targeting glutes.
Good alternatives to the Clamshell include: Fire Hydrant, Side-Lying Hip Abduction, Banded Clamshell. These exercises target similar muscle groups as the Clamshell and can be used as substitutes based on your equipment availability, gym setup, or training preferences.
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Safety Notes
- Keep movements controlled.
- Stop if you feel hip pain.