Primary
Glutes
Secondary
Hip abductors
Equipment
Bodyweight
Difficulty
Beginner
Type
Rotation
See how Clamshell could fit a workout
The example below shows one possible placement. Your purchased plan is built from your assessment, and Ely checks every exercise before approving it.
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This page is not medical advice or a rehabilitation protocol. Ely's personal review applies to purchased workout plans and does not replace an in-person assessment by a licensed healthcare professional.
Clamshell is a beginner-level general fitness movement that trains Glutes (gluteus medius). Use a controlled, comfortable range and an easy starting effort. This guide does not assess pain or provide an injury-recovery protocol.
When to use it
Use Clamshell only for general fitness when you can perform it comfortably. For pain, injury, surgery, or a medical condition, follow a licensed healthcare professional's instructions instead.
Who it's for
Adults using the movement for general fitness who can perform it without pain. Clinical concerns require guidance from a licensed healthcare professional.
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.
Also targets: hip abductors
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Lie on your side with knees bent at 45 degrees.
Stack your hips and keep feet together.
Rest your head on your bottom arm.
Keeping feet together, rotate your top knee upward.
Open as far as you can without rotating your pelvis.
Lower with control and repeat.
Keep your hips stacked - don't roll backward.
Move slowly and with control.
Focus on feeling the outer glute work.
For general fitness, start Clamshell with 1-2 light, controlled sets and increase only when the movement remains comfortable. This is not rehabilitation dosage; use the frequency and progression given by your licensed healthcare professional for an injury or surgery.
Rolling hips backward to lift higher.
Changing your back position during the Clamshell can alter the movement and make the load harder to control. Brace your midsection and keep the torso position called for by the exercise.
Using momentum instead of controlled muscle contraction.
Bouncing or using momentum during the Clamshell makes the movement harder to control and can shift work away from your Glutes (gluteus medius). Use a load you can move smoothly through the intended range.
Not controlling the lowering phase.
Rotational exercises like the Clamshell generate force through your midsection. This mistake reduces control and can shift work away from your Glutes (gluteus medius). Move deliberately through the intended range.
Adults using the movement for general fitness who can perform it without pain. Clinical concerns require guidance from a licensed healthcare professional.
These ranges illustrate ways to organize training. They are not an individual prescription. Adjust them for the exercise, your experience, and the rest of your program.
Heavier loads can be useful for developing maximum strength. The range shown is an example, and the load must match your current technique and capacity.
Muscle growth can occur across different loads and repetition ranges. This example is not a uniquely effective zone; your overall program and effort also matter.
This is an example of a longer set. A repetition target alone does not establish joint safety or whether the exercise is appropriate for you.
Example: 3 sets of 15-20 reps per side. Rest 30s.
Background for resistance exercises: the 2026 ACSM position stand covers healthy adults, and a load-comparison review found similar muscle growth across loads in studies using sets taken to muscular failure. These findings do not validate every exercise-specific range shown here or require training to failure.
This is one example of how Clamshell could sit inside a complete workout. Your plan may use different movements after Ely checks your assessment.
Sample workout
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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.
Our library labels Clamshell as beginner. That category is not an individual assessment. Review the setup, movement instructions, and safety notes, and seek qualified guidance if you are unsure how to perform it.
The programming section shows examples for Clamshell. The appropriate amount depends on your current ability, the exercise, and your other training. The listed ranges are not an individual prescription or a guarantee of a particular outcome.
The main equipment listed for Clamshell is no equipment. Check the instructions for any additional support, anchor, bench, rack, or clear space needed. The equipment label alone does not confirm that your home setup is suitable.
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.