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Last updated February 2, 2026
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abs

Lying Elbow To Knee

Lie flat. Crunch up and twist to bring one elbow to the opposite knee. Switch sides. This combines a crunch with a twist for total core work.

Quick facts

Difficulty
Easy
Mechanic
Isolation
Force
Pull
Type
Strength
Injury Risk
Low
Hypertrophy
Medium
Calorie Burn
Medium

Muscle focus

Primary and secondary muscle groups targeted by this movement.

Primary

side abs / obliques

Secondary

abs

Equipment & setup

What you need and how to position yourself before starting.

Equipment

body weight

Movement pattern

Alternate

Posture

Lying

Tracking parameters

repsweight

Step-by-step instructions

Follow these cues to master proper technique and stay safe through every rep.

  1. Step 1Setup
    • Lie flat on your back on a mat or exercise bench.
    • Bend your knees and place your feet flat on the floor, hip-width apart.
  2. Step 2Position Your Arms
    • Place your hands behind your head, with your elbows pointing out to the sides.
    • Ensure your head is supported by your hands, and your neck is relaxed.
  3. Step 3Engage Your Core
    • Tighten your abdominal muscles to stabilize your torso.
    • Keep your lower back pressed against the mat to prevent arching.
  4. Step 4Lift Your Legs
    • Raise your legs off the ground, bending your knees at a 90-degree angle.
    • Your thighs should be perpendicular to the floor.
  5. Step 5Perform the Movement
    • Simultaneously bring your right elbow towards your left knee while extending your right leg out.
    • Focus on using your core to initiate the movement.
  6. Step 6Switch Sides
    • Return to the starting position and repeat the movement on the opposite side.
    • Bring your left elbow towards your right knee while extending your left leg out.
  7. Step 7Repeat
    • Continue alternating sides for the desired number of repetitions.
    • Maintain controlled movements and proper form throughout the exercise.
  8. Step 8Finish the Exercise
    • After completing your reps, lower your legs back to the ground.
    • Carefully sit up and stretch your body to relax your muscles.
Version 1 · Created November 12, 2025