Side Jackknife

Lie on your side like a cozy bear in a den, then crunch your ribs and legs together like you are trying to hug your own hips. Keep your neck long and your belly braced. Slow and steady makes your obliques growl with strength without any wobbly rolling.

Instructions

1. Lie on your side with legs straight, body in a straight line, and hips stacked.
2. Place your bottom arm straight on the floor for balance; place your top hand lightly behind your head or on the floor in front.
3. Brace your core and keep your chest open without rolling forward or backward.
4. Lift your legs and torso at the same time, bringing your elbow and knees toward each other.
5. Pause briefly at the top while keeping hips stacked and spine long.
6. Lower with control to the start position and repeat, then switch sides.

Benefits

• Builds strength and endurance in the obliques
• Improves lateral core stability for sports and daily movement
• Trains hip abductor involvement and pelvic control
• Enhances coordination between trunk and lower body

Key Points

• Keep hips stacked; avoid rolling onto your back or stomach.
• Lead the movement with your obliques, not neck pulling.
• Lift and lower slowly to keep tension on the side core.
• Exhale as you crunch up; inhale as you lower.
• Keep legs together and straight (or slightly bent if needed).

Common Mistakes

• Rolling the torso or hips instead of staying stacked
• Pulling on the head or shrugging the shoulders
• Using momentum and bouncing through reps
• Letting the lower back arch or ribs flare
• Only lifting legs or only lifting torso instead of both together