Quick Answer
Clamshell is a beginner strength exercise that targets your abductors. It uses only your bodyweight. Lie on your side with legs stacked and knees bent at a 45-degree angle.
Video Tutorial
How to Perform the Clamshell
- 1
Lie on your side with legs stacked and knees bent at a 45-degree angle.
- 2
Keep your feet touching and lift your top knee as high as possible without moving your pelvis.
- 3
Pause at the top, then slowly lower your knee back to the starting position.
Common Mistakes to Avoid
- !Rushing reps instead of controlling the lowering (eccentric) phase — aim for 2–3 seconds down.
- !Letting form break down as reps add up. Stop the set when technique slips, not when you physically can't do another rep.
- !Using momentum instead of muscle tension. Slow the tempo and feel the target muscle doing the work.
Tips for Better Form
- ✓Breathe out during the effort (concentric) and breathe in on the return (eccentric).
- ✓Use a mirror or film yourself on your first session — your perceived form and actual form often differ.
- ✓Brace your core as if someone were about to punch you in the stomach. This stabilizes your spine in every rep.
- ✓Don't worry about load — master the movement pattern with light weight or easier variations first.
Alternative Exercises
If the Clamshell isn't right for your body, equipment, or goal, try these similar exercises that hit the same muscle groups:
Frequently Asked Questions
What muscles does the Clamshell work?
The Clamshell primarily works your abductors. Secondary muscles include the glutes.
What equipment do I need for the Clamshell?
The Clamshell needs no equipment — just your bodyweight. You can perform it at home or at the gym as long as you have what's listed.
Is the Clamshell suitable for beginners?
Yes. The Clamshell is a beginner-level exercise. Start with lighter load or fewer reps and focus on form before adding intensity.
How many sets and reps of Clamshell should I do?
For strength: 3–5 sets of 3–6 reps with longer rest (2–3 min). For hypertrophy (muscle growth): 3–4 sets of 8–12 reps with moderate rest (60–90 sec). For endurance: 2–3 sets of 15+ reps with short rest (30–45 sec). Adjust based on your program and goal.
Can I do the Clamshell every day?
No. Muscles need 48 hours to recover between heavy training sessions. If you want to train abductors more frequently, alternate harder and easier variations and keep overall weekly volume moderate.