Foam Roller Knee Tuck

Secondary muscles
Hip Flexors
Body part
Core
Position
Lying
Laterality
Bilateral (both sides together)
Category
Strength

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Gripping a roller between your feet gives the legs a rolling contact point with the floor, so the knees travel toward your chest along a track instead of swinging freely through the air. Holding the roller adds a squeeze from the inner legs, and the track smooths the lowering phase where reverse crunches usually collapse.

How to do the Foam Roller Knee Tuck

  1. Lie flat on your back with your arms extended straight above your head and your legs straight out in front of you.
  2. Place the roller between your feet and grip it with your toes.
  3. Engaging your abs, lift your legs off the ground and curl your knees towards your chest, rolling the roller towards your body.
  4. Pause for a moment at the top, then slowly lower your legs back down to the starting position, rolling the roller away from your body.
  5. Repeat for the desired number of repetitions.

Tip: Breathe out as you crunch and let the last bit of air leave the lungs at the top of each rep.

Muscles worked

Primary

Abs · Core

The rectus abdominis shortens to bend the spine forward, and each rep should end with the upper abs fully contracted and the ribs pulled down.

Secondary

  • Hip Flexors — The hip flexors take over if your feet are anchored and you come up too high; keep the range short to leave them out.

Common mistakes

  • Pulling on the neck — hands behind the head should support, not yank; keep the elbows wide and the chin about a fist away from the chest.
  • Sitting all the way up — a crunch is a curl of the ribs toward the pelvis, not a sit-up; the lower back should stay on the floor the whole time.
  • Cranking out fast reps — momentum does the work if you bounce; lift to a squeeze, hold for a count and lower slowly.
  • Never adding load — once bodyweight reps get easy, hold a plate on the chest or use a cable rather than doing sets of 50.

Where it fits in a workout

Crunches close out a session after the heavy work, or they can fill the rest periods between sets of a lift that does not need much bracing. Pair a cable crunch with a cable side bend on the same stack.

How many sets, how heavy and how hard: see what the ACSM position stands support.

Variations and alternatives

Similar exercises

Without ab wheel

Easier and harder

When to talk to someone

  • Chest discomfort, feeling faint or lightheaded, or trouble breathing during or after exercise can be signs of a heart attack. In the US, call 911 right away; elsewhere, call your local emergency number.
  • Heart, metabolic or kidney disease, or symptoms like these when you are active: talk to your doctor before you start or step up training.
  • Pregnant: ask your obstetric care provider which exercise suits you.

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More exercises

Sources

  1. ACSM position stand on exercise quantity and quality (Garber et al., 2011)
  2. ACSM preparticipation health screening (Riebe et al., 2015)
  3. ACOG Committee Opinion No. 804 on exercise in pregnancy (2020)
  4. CDC: About Heart Attack Symptoms, Risk, and Recovery (2024)

Sources checked on October 17, 2026. Full citations are in the exercise library.

Animation and exercise data: ExerciseDB, licensed to SetGrip. General information, not medical or coaching advice.