The Elbow-to-Knee Crunch, also known as the Bicycle Crunch, is a popular abdominal exercise that targets the rectus abdominis (commonly referred to as the “six-pack” muscles) and the obliques. It is a dynamic core exercise that involves a twisting motion and combines both upper and lower body movements. This exercise is effective for strengthening the abdominal muscles and enhancing core stability. In this comprehensive guide, we will explore the technique, benefits, and alternatives to the Elbow-to-Knee Crunch.

Instructions for Elbow-to-Knee Crunch


  1. Position: Lie flat on your back on a comfortable exercise mat or the floor. Extend your legs fully, and keep your feet together.
  2. Hands Behind Your Head: Place your hands gently behind your head, fingertips lightly supporting your head, and your elbows pointing outward.


  1. Initiate the Crunch: Begin the movement by lifting your head, neck, and shoulders slightly off the ground. This action engages your upper abs.
  2. Simultaneous Leg Movement: As you lift your upper body, bend your right knee and bring it toward your chest while simultaneously twisting your torso to the left.
  3. Elbow to Knee: As your right knee comes toward your chest, bring your left elbow toward your right knee. Try to touch or get as close as possible while keeping your upper body off the ground.
  4. Extension: Extend your right leg straight while simultaneously switching to the left knee coming toward your chest and your right elbow toward your left knee. This creates a pedaling or cycling motion.
  5. Repeat: Continue this pedaling motion, alternating between sides, while keeping your upper body lifted off the ground.
  6. Breathing: Exhale as you crunch and bring your elbow toward your knee, and inhale as you extend your leg and switch to the other side.
  7. Repetitions: Perform the desired number of repetitions while maintaining proper form.


  • Focus on the quality of the movement rather than speed. Perform each repetition deliberately and controlled.
  • Keep your elbows wide and avoid pulling on your head or neck to prevent strain.
  • Maintain a steady and controlled pace to engage the core effectively.
  • Keep your lower back in contact with the mat or floor to avoid excessive arching.


  1. Core Strengthening: The Elbow-to-Knee Crunch is an effective exercise for strengthening the entire core, including the rectus abdominis and obliques.
  2. Oblique Emphasis: The twisting motion involved in this exercise engages the oblique muscles, helping to create definition along the sides of the abdomen.
  3. Functional Core Stability: It enhances core stability, which is essential for maintaining proper posture, reducing the risk of lower back pain, and improving overall strength in various daily activities.
  4. Dynamic Movement: This exercise incorporates a dynamic movement pattern that mimics activities that require twisting and rotational control.
  5. Calorie Burn: The Elbow-to-Knee Crunch is a compound exercise that engages multiple muscle groups and can contribute to calorie burn during workouts.
  6. Variation: It provides a variation to traditional crunches, making it an interesting addition to core workouts.

Alternatives for Elbow-to-Knee Crunch

While the Elbow-to-Knee Crunch is an effective exercise for working the core, there are alternative movements that can provide similar benefits and add variety to your abdominal training routine:

  1. Traditional Crunch: Perform a standard crunch by lifting your head, neck, and shoulders off the ground without the twisting motion. This variation emphasizes the upper portion of the rectus abdominis.
  2. Leg Raises: Lie flat on your back and lift both legs toward the ceiling while keeping them straight. Lower your legs back down without letting them touch the ground to engage the lower abs.
  3. Plank: Assume a push-up position with your arms extended and your body in a straight line from head to heels. Hold this position to engage the entire core, including the obliques.
  4. Russian Twist: Sit on the floor with your knees bent and feet flat. Lean back slightly and lift your feet off the ground. Hold a weight or medicine ball and twist your torso from side to side.
  5. Hanging Leg Raise: Hang from a pull-up bar and lift your legs toward your chest while keeping them straight. Lower your legs and repeat for lower abdominal engagement.
  6. Side Plank: Lie on your side with your elbow directly under your shoulder and lift your hips off the ground to create a straight line from head to heels. This variation targets the obliques.
  7. Dead Bug: Lie on your back with your arms extended toward the ceiling and your knees bent at a 90-degree angle. Lower one arm and the opposite leg toward the ground while maintaining contact between your lower back and the floor.
  8. Cable Woodchoppers: Attach a handle to a cable machine and perform woodchopper movements to engage the obliques in a standing position.

Incorporating a variety of core exercises into your training routine can help you achieve a well-rounded and strong core, improve stability, and prevent overuse injuries. Depending on your goals and preferences, you can rotate through these exercises to keep your core workouts challenging and effective.

In conclusion, the Elbow-to-Knee Crunch, or Bicycle Crunch, is an effective exercise for strengthening the entire core and emphasizing the oblique muscles. When performed with proper form and controlled movements, it can be a valuable addition to your core training program. If you’re new to this exercise or have specific fitness goals, consider consulting with a fitness professional or personal trainer for guidance.

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