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Exercise library / Plank Knee Tuck

Plank Knee Tuck

Suggestions, not prescriptions. Exercises here pass automated checks. They have not been clinically reviewed, and no exercise is right for everyone. Adjust to your comfort and ability.

A more challenging exercise. Make it a goal if you like. “Show alternatives” below lists easier steps toward it.

A moving core drill performed from a high plank: the body holds its straight line while one knee is drawn in under the chest and sent back, alternating sides. Slower and more controlled than a mountain climber, it trains the abdominals and hip flexors while the shoulders and trunk stay braced.

Main focus
Strength
Level
Building
Equipment
Bodyweight, A mat
Load
Your body weight
Stability
Supported by a seat, bench or wall
Before you start
  • Warm up first with a minute or two of easy walking or marching in place, and cool down the same way after.
  • Wear flat, closed shoes with a good grip, or go barefoot on a non-slip floor if that feels steady to you.
  • Clear the floor around you. Keep a sturdy chair, counter or wall within reach for any move you do standing.
  • Build up slowly. Add repetitions or minutes over weeks, not days. If you take a break, work back up gradually.

Talk with a doctor or physical therapist before you start if you have not been active for some time, if you have a health condition or a worry about exercise, if you have fallen or fear falling, or if a clinician has told you to limit activity. This library is general information, not medical advice.

What you need

A mat or a firm, clear patch of floor, and a sturdy chair or bench nearby to help you get up.

How to do it

  1. Set up in a high plank with the hands under the shoulders and the body in a straight line from head to heels.
  2. Press the floor away and brace the trunk so the hips neither sag nor pike.
  3. Draw one knee in towards the chest without letting the hips rise.
  4. Extend the leg back to the starting position under control.
  5. Repeat with the other leg and keep alternating for the desired number of repetitions.

How much

To start: 1 to 2 sets of 8 to 12 slow repetitions, resting 1 to 2 minutes between sets.

As it gets easier: 2 to 3 sets of 6 to 12 repetitions with good form, resting 1 to 3 minutes. Add load or repetitions gradually, no more than about once a week.

How it should feel: The muscles you are working should feel the effort. The last repetitions should be hard but controlled, never shaky or painful.

Make it easier

Use the other ways to do this movement below.

Make it harder

Use the other ways to do this movement below.

Tips

  • Keep the hips level with the shoulders; letting them lift turns this into a pike.
  • Pull the knee in with the abdominals rather than by hopping off the supporting foot.
  • Keep the shoulders stacked over the wrists and push the floor away so the upper body does not sink.

Safety

  • Warm up first, and keep your breathing steady. Breathe out on the effort and in as you ease off. Do not hold your breath.
  • Move with control. Do not lock your joints straight at the end of a movement.
  • Choose a version, load and number of repetitions you can finish with good form. The last few should feel hard but not shaky.
  • Getting down to the floor and back up is part of this exercise. Use a sturdy chair or bench to help you, and move slowly.
More safety notes
  • If you cannot get up from the floor on your own, choose a standing or seated alternative, or have someone with you.
  • Pad bony spots, such as knees, with a mat or folded towel.

When to stop

  • Stop and rest if you feel dizzy or lightheaded, sick to your stomach, or unusually short of breath.
  • Stop if you feel sharp, sudden or joint pain. Muscles working hard is expected. Pain is a signal to stop.
  • Stop and sit down if you feel unsteady and cannot settle yourself right away.
  • Call your local emergency number for chest pain or pressure, fainting, or sudden weakness, numbness or trouble speaking.
  • After any of these, do not repeat the exercise until you have talked with a doctor or physical therapist.
  • You cannot get up from the floor without help.
  • You feel dizzy when you change position.

Other ways to do this movement

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Where this comes from

Steps and tips are from an open exercise dataset named below. Starting amounts, equipment and safety notes are Fitafter50's general guidance. Nothing here is clinically reviewed.

Steps and tips: Exercise data by RepDB (repdb.co). License: RepDB Free Tier License v1.0: personal or commercial use inside applications, visible attribution, no redistribution as a dataset or API. All credits.

    This is general information, not medical advice. It does not diagnose anything or tell you whether an exercise is right for you. Adjust to your comfort and ability.