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Lying Knee Tuck 101 Video Tutorial

Home Modified Variation Core Exercise


Lying Knee Tuck
Lying Knee Tuck

Exercise Synopsis

Target Muscle Group


Secondary Targets



Force Type

Pull (Bilateral)

Required Equipment

Body Weight

Fitness Level












The Lying Knee Tuck is a bodyweight exercise primarily targeting the abdominal muscles, with secondary engagement of the lower back. In this exercise, you lie flat on your back with your arms extended alongside your body and your legs straight. Then, you lift your legs off the ground and bend your knees towards your chest, contracting your abs to bring your knees as close to your torso as possible. By controlling the movement and focusing on contracting the abdominal muscles, you effectively work the abs while also engaging the lower back muscles for stabilization. This exercise requires no equipment beyond your body weight, making it accessible for strengthening the core muscles and improving overall stability.

How to Perform

  1. Begin by lying on your back in a comfortable position, legs straight, and arms resting alongside your body.

  2. To provide support, you may place your hands underneath your low back, ensuring a stable and comfortable position.

  3. Engage your abdominal muscles as you exhale and lift your knees towards your forehead, aiming for a controlled movement.

  4. Continue lifting until your abs are fully contracted and your knees are slightly above parallel to the floor.

  5. Slowly lower your legs back to the starting position with control, inhaling as you descend to engage the muscles effectively.

  6. Throughout the exercise, maintain a steady pace and focus on the contraction of the abdominal muscles to maximize effectiveness.

  7. Avoid arching your back excessively or using momentum to lift your legs, as this can strain the lower back and reduce the effectiveness of the exercise.

  8. Be mindful of your breathing pattern, exhaling as you lift your knees and inhaling as you lower them back down.

  9. While the primary focus is on the abs, engage your lower back muscles to stabilize your spine and maintain proper alignment throughout the movement.

  10. Incorporate this exercise into your core workout routine to strengthen the abdominal muscles and improve overall core stability and strength.


  1. Focus on exhaling forcefully during the Lying Knee Tuck, similar to blowing out candles on a cake, to engage the abdominal muscles effectively and enhance the mind-muscle connection for better results.

  2. If you experience discomfort in your lower back during this exercise, opt for movements that emphasize anti-extension and anti-rotation to alleviate strain and protect your spine.

  3. Refrain from placing your hands behind your head during the exercise, as this can cause excessive strain on the neck muscles and compromise proper form and alignment. Instead, keep your hands resting on the floor or alongside your body for stability.

How Not to Perform

  1. Avoid Using Momentum: Do not swing your legs or use momentum to lift them towards your chest. This can diminish the effectiveness of the exercise and increase the risk of strain or injury to the lower back.

  2. Do Not Lift Your Head: Avoid lifting your head off the ground during the movement. Keeping your head relaxed on the floor helps prevent neck strain and allows for better isolation of the abdominal muscles.

  3. Avoid Overarching Your Lower Back: Refrain from arching your lower back excessively as you lift your knees towards your chest. This can strain the lower back muscles and detract from the focus on the abs.

  4. Don't Rush the Movement: Avoid rushing through the exercise. Perform each repetition with controlled movements to maximize muscle engagement and minimize the risk of injury.

  5. Do Not Hold Your Breath: Avoid holding your breath during the exercise. Remember to breathe steadily and rhythmically throughout each repetition to maintain oxygen flow to your muscles and improve performance.

  6. Avoid Fully Extending Your Legs: Do not fully extend your legs during the lowering phase of the exercise. Keeping a slight bend in your knees helps maintain tension on the abdominal muscles and prevents strain on the lower back.

  7. Do Not Neglect Core Engagement: Avoid neglecting to engage your core muscles throughout the exercise. Focus on contracting your abs to lift your knees towards your chest, rather than relying solely on hip flexor strength.

  8. Avoid Excessive Neck Strain: Refrain from straining your neck by pulling on your head with your hands. Instead, keep your hands relaxed by your sides or underneath your lower back for support.

  9. Don't Sacrifice Form for Repetitions: Avoid sacrificing proper form for the sake of completing more repetitions. Focus on quality over quantity to effectively target the abs and secondary muscles while minimizing the risk of injury.

  10. Avoid Jerky Movements: Do not perform the exercise with jerky movements. Smooth and controlled motions are essential for effectively targeting the abs and avoiding unnecessary strain on the lower back.


Variations of fitness exercises refer to different ways of performing a specific exercise or movement to target various muscle groups, intensities, or goals. These variations aim to challenge the body differently, prevent plateaus, and cater to individuals with varying fitness levels.


Alternative exercises in fitness refer to different movements or activities that target similar muscle groups or serve the same training purpose as the primary exercise. These alternative exercises can be used as substitutes when the original exercise is unavailable or challenging to perform due to various reasons such as equipment limitations, injuries, or personal preferences.


Body Weight






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