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Core Bodyweight Beginner Unilateral Video

How to do the Alternating Knee Tucks (Crunch Position)

Primary: Core.

Dynamic ab work in crunch position.

Demo video: Alternating Knee Tucks (Crunch Position) · from the Fitbe exercise library Open in Fitbe →

Step by step

  1. 1

    Hold crunch position.

  2. 2

    Tuck knees alternately toward chest.

  3. 3

    Breathe steadily.

Coaching cues

  • Maintain proper form

Sets, reps and where it fits

Muscle

3–4 × 12–16

rest 60–90 s

Strength

not a strength lift

use for assistance

Fat loss

3 × 12–16

rest 45–60 s

Impact: high Knee stress: low Spine load: low Home-friendly

Alternating Knee Tucks (Crunch Position) alternatives

Same movement pattern, different equipment or difficulty. Swap one-for-one in any plan.

Bicycle CrunchBodyweight · beginner Bird DogBodyweight · beginner CrunchBodyweight · beginner Dead BugBodyweight · beginner Flutter KickBodyweight · beginner Lying Leg RaiseBodyweight · beginner

Frequently asked questions

What muscles does the Alternating Knee Tucks (Crunch Position) work?

Primary: Core.

How many sets and reps of Alternating Knee Tucks (Crunch Position) should I do?

For muscle: 3–4 sets of 12–16 reps. For strength on compound lifts: 4–5 sets of 4–6. Rest 60–120 seconds between sets.

What can I do instead of the Alternating Knee Tucks (Crunch Position)?

Same movement pattern, different equipment: Bicycle Crunch, Bird Dog, Crunch, Dead Bug, Flutter Kick, Lying Leg Raise.

Is the Alternating Knee Tucks (Crunch Position) good for beginners?

Yes. It is a beginner-friendly movement; start light, master the steps above and add load gradually.