Hollow-Body Knee Tuck 101 Video Tutorial
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Exercise Synopsis
Target Muscle Group
Abs
Secondary Targets
Execution
Isolation
Force Type
Core
Required Equipment
Bodyweight
Fitness Level
Intermediate
Variations
None
Alternatives
None
Timer
Hour
Minute
Second
Stopwatch
00:00:00:00
Overview
Hollow-Body Knee Tuck is a bodyweight exercise that primarily targets the abs while also engaging the hip flexors. It is performed from a hollow-body position, where the lower back is pressed into the floor, legs extended, and arms overhead or forward. The movement involves tucking the knees toward the chest and then extending them back out while maintaining the hollow position, requiring continuous core engagement. This exercise improves core strength, stability, and control, emphasizing the coordination between the abdominal muscles and hip flexors.
How to Perform
Lie flat on your back with your lower back pressed firmly into the floor.
Extend your legs straight and lift them slightly off the ground, keeping your arms extended overhead or forward.
Engage your core by tightening your abs and pressing your lower back into the floor.
Slowly tuck your knees toward your chest while keeping your upper back slightly lifted off the floor.
Hold the tucked position briefly, maintaining tension in your abs and hip flexors.
Slowly extend your legs back out to the starting hollow-body position without letting your lower back arch.
Repeat the movement for the desired number of repetitions, keeping your core engaged throughout.
★ Bonus: For exercises that involve external weights (such as dumbbells, barbells, or machines), the One Rep Max (1RM) calculator can help you estimate your maximum lifting capacity. Use it to track your strength progress and adjust your training for optimal results.
Tips
Keep your lower back pressed firmly into the floor throughout the movement.
Maintain constant tension in your abs to prevent momentum from taking over.
Control both the knee tuck and leg extension phases slowly and deliberately.
Avoid lifting your hips off the floor during the tuck.
Keep your arms extended forward or overhead to increase core engagement.
Focus on breathing steadily, exhaling as you tuck and inhaling as you extend.
Engage your hip flexors without letting them dominate the movement.
Keep your legs straight as much as possible when extending back to hollow position.
Start with smaller knee tucks if full range of motion compromises form.
Pause briefly at the tucked position to maximize core activation.
How Not to Perform
Don’t let your lower back arch off the floor during the movement.
Don’t use momentum to swing your legs instead of controlled core engagement.
Don’t lift your hips or pelvis off the ground while tucking your knees.
Don’t bend your arms or pull on your head/neck to assist the movement.
Don’t rush through repetitions; avoid performing them too quickly.
Don’t allow your hip flexors to dominate and take over the effort from your abs.
Don’t hold your breath; maintain steady breathing throughout.
Don’t extend your legs too low if it causes your lower back to lift.
Don’t relax your core between reps; keep tension constant.
Don’t let your shoulders completely rest on the floor; keep them slightly lifted.
Variations
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.
Alternatives
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.
