Exercise guide
Seated Alternate Leg Abduction And Extension
- Beginner
- Compound
- Rep-based
- Upper legs
- Waist
This beginner-friendly seated exercise targets the lower abdominals and quadriceps through a combination of hip abduction and knee extension, enhancing core stability and leg definition.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit on the edge of a sturdy chair or bench with your feet flat on the floor and knees bent at 90 degrees.
- Grip the sides of the seat firmly to stabilize your torso and lean back slightly while keeping your spine neutral.
- Engage your core by pulling your navel toward your spine to create a solid base.
How to do it
- Lift your right foot slightly off the floor, then simultaneously extend your knee and move your leg outward away from the midline.
- Exhale during the extension and abduction phase, squeezing your quadriceps and lower abs at the peak of the movement.
- Inhale as you reverse the motion, bringing the leg back to the center and returning your foot to the starting position.
- Repeat the entire sequence with the left leg, alternating sides with a controlled, 2-1-2 tempo (2 seconds out, 1 second hold, 2 seconds back).
Form checklist
- Keep your chest lifted and avoid rounding your lower back as you lean.
- Ensure the movement comes from the hip and knee, not by tilting your torso to the side.
- Keep your toes pointed upward throughout the extension to maintain tension in the quadriceps.
- Maintain a firm grip on the seat to prevent your hips from sliding forward.
Pro tips
- Focus on the 'peak contraction' by holding the leg at full extension and maximum abduction for one second to maximize muscle fiber recruitment.
- Keep your non-working leg pressed firmly into the floor to help stabilize your pelvis and isolate the core.
Make it harder
- Perform the movement with your hands behind your head or reaching forward to remove the stability of the chair grip.
- Add a light resistance band just above your knees to increase the tension on the hip abductors.
Frequently asked
- What muscles does the seated alternate leg abduction and extension work?
- The seated alternate leg abduction and extension primarily targets the abs, and also works the glutes as secondary muscles.
- What equipment do you need for the seated alternate leg abduction and extension?
- The seated alternate leg abduction and extension requires no equipment — just your body weight.
- Is the seated alternate leg abduction and extension good for beginners?
- Yes. The seated alternate leg abduction and extension is a beginner-friendly movement and a strong foundation to build on.