Lying Side Straight Legs Reverse Crunch
Lying Side Straight Legs Reverse Crunch Exercise Description
The lying side straight legs reverse crunch targets the obliques through controlled lateral trunk flexion while you maintain stacked hips and a neutral neck. Lying on one side with legs extended, you lift your straight legs and rib cage toward each other, bringing the pelvis and thorax closer on the working side. The primary drivers are the ipsilateral external and internal obliques, with assistance from the quadratus lumborum; the rectus abdominis and deep abdominals contribute to trunk stability. Keeping the legs straight increases the lever arm, emphasizing control over momentum and reinforcing pelvic and spinal stability. This bodyweight variation is useful for learning to brace, limit unwanted rotation, and produce smooth, segmental movement through the lateral trunk.
- Muscle Groups: Abs, Obliques, Waist
- Target Muscles: External Obliques, Internal Obliques
- Assisting Muscles: Quadratus Lumborum
- Stabilizing Muscles: Rectus Abdominis, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core
- Body Surface: Side
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Lateral Flexors, Trunk Rotators
- Joint Involvement: Multi-joint
- Muscle Location: Deep Side Abs, Side Abs
- Movement Direction: Lateral
- Muscle Position: Lateral
- Gender: Male
How To Do The Lying Side Straight Legs Reverse Crunch Exercise
‘- Lie on your side with legs straight and stacked, ankles together, body in one line.
– Support your head with the bottom arm; place the top hand lightly on the floor in front of your chest or behind your head (don’t pull the neck).
– Stack hips and shoulders; draw ribs down and lightly brace the abdominals.
– Set a slight posterior pelvic tilt to avoid lumbar arching.
– Exhale and lift both straight legs a few inches while bringing your top rib cage toward your pelvis (lateral flexion).
– Keep hips stacked—avoid rolling forward or backward.
– Move smoothly; keep knees straight and feet together; no swinging.
– Pause briefly at the top with tension; maintain a neutral, untucked chin.
– Inhale and lower the legs under control to a light touch.
– Switch sides and repeat, keeping the same setup and control.
Lying Side Straight Legs Reverse Crunch Tips
‘- Lie on your side with legs straight and stacked, ankles together, so your body forms one line.
– Support your head with the bottom arm and avoid pulling on your neck with the top hand, whether it’s on the floor or behind your head.
– Stack hips and shoulders vertically and keep them stacked throughout; avoid rolling forward or backward.
– Draw the ribs down and lightly brace the abdominals before you start moving.
– Maintain a slight posterior pelvic tilt to avoid arching through the lower back.
– Exhale as you lift both straight legs a few inches while bringing the top rib cage toward your pelvis.
– Keep the knees straight and feet together, moving smoothly without swinging.
– Pause briefly at the top with tension, keeping your chin neutral and not tucked.
– Inhale and lower the legs under control until they lightly touch down.
– Switch sides and repeat, using the same setup and controlled movement.
Lying Side Straight Legs Reverse Crunch Beginner Introduction
The lying side straight legs reverse crunch is a bodyweight core move performed while resting on one side with the body aligned in a straight line. Both legs stay long and together as they lift, while the ribs on the upper side gently draw toward the pelvis, creating a controlled side bend. The action brings the legs and upper torso closer on one side without large or jerky motions, emphasizing precision over speed.
This exercise places strong emphasis on the side abs, with help from the abs, deep core, and the muscles along the side of the lower back to support the movement. Because the legs remain straight, the load on the mid-section increases, highlighting control and balance rather than momentum. The neck stays in line with the spine and the hips remain stacked, encouraging a stable base as the torso moves. Over time, this pattern can sharpen awareness of how the trunk bends sideways while the rest of the body stays quiet and aligned.