Exercise guide
Sitting Floor Side To Side Leg Raise In Out Crunch
- Intermediate
- Compound
- Rep-based
- Upper legs
- Waist
This compound core exercise targets the lower rectus abdominis and obliques by combining a lateral leg lift over an obstacle with a knee-to-chest crunch. It builds rotational stability and hip flexor strength while maintaining constant tension on the abdominal wall.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit on the floor with your legs extended and place a dumbbell standing upright on the floor in front of your feet as a hurdle.
- Place your hands on the floor slightly behind your hips (or grip the edges of a flat bench if seated on one) for stability.
- Lean your torso back at a 45-degree angle and engage your core to maintain a neutral spine.
- Position both feet together on the left side of the dumbbell to begin.
How to do it
- Exhale as you lift both legs together over the dumbbell to the right side, keeping a slight bend in the knees.
- Once your feet clear the dumbbell, immediately pull your knees toward your chest in a crunching motion while slightly bringing your torso forward.
- Inhale as you extend your legs back out to the right side, then lift them back over the dumbbell to the starting left side.
- Perform a crunch on the left side and repeat the alternating pattern with a controlled, fluid tempo.
Form checklist
- Keep your chest lifted and avoid rounding your shoulders or lower back.
- Ensure your feet stay glued together throughout the entire movement.
- Maintain a 'hollow' core position to prevent the lower back from arching.
- Focus on lifting the legs using the lower abs rather than just swinging the hip flexors.
Pro tips
- To maximize oblique engagement, slightly rotate your knees toward your shoulder during the 'in' phase of the crunch.
- Hover your feet just an inch off the floor at the bottom of each rep to maintain constant tension on the rectus abdominis.
- Slow down the 'out' phase of the crunch to increase the eccentric load on the core.
Make it harder
- Perform the exercise with your hands lifted off the floor and held across your chest to remove the stability support.
- Hold a light medicine ball or a small dumbbell between your feet to increase the resistance on the lower abs.
Frequently asked
- What muscles does the sitting floor side to side leg raise in out crunch work?
- The sitting floor side to side leg raise in out crunch primarily targets the abs and obliques, and also works the erector spinae as secondary muscles.
- What equipment do you need for the sitting floor side to side leg raise in out crunch?
- The sitting floor side to side leg raise in out crunch uses dumbbell.
- Is the sitting floor side to side leg raise in out crunch good for beginners?
- The sitting floor side to side leg raise in out crunch is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.