Skip to content
Crucible Fit
  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Pricing
Get Crucible
  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Apple Watch
  • Pricing
  • FAQ
  • Training Guides
Get Crucible
Crucible Fit

A daily functional fitness test for iPhone, Apple Watch and Android. Stations, reps and the Crux, sized to your readiness and your kit.

Download on the App StoreGet it on Google Play

Crucible Fit

  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Apple Watch
  • Pricing

Explore

  • Training Guides
  • Exercise Library
  • FAQ
  • Press
  • Support

Legal

  • Terms and Conditions
  • Privacy Policy
  • Consumer Health Data Notice

CRUCIBLE FIT™ and Crux by Crucible Fit are trademarks of Crucible Fit, LLC.

© 2026 Crucible Fit, LLC. All rights reserved. Apple, the Apple logo, iPhone and Apple Watch are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc. Google Play and the Google Play logo are trademarks of Google LLC.

  1. Home
  2. /
  3. Exercises
  4. /
  5. Core & Abs
  6. /
  7. Resistance Band Lying Bent Knee Raise

Exercise guide

Resistance Band Lying Bent Knee Raise

  • Intermediate
  • Compound
  • Rep-based
  • Waist

This exercise targets the lower abdominals and hip flexors by using a resistance band to provide constant tension throughout the movement. It is highly effective for improving core stability and developing the lower portion of the rectus abdominis.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Resistance Band Lying Bent Knee Raise demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Abs

Secondary

  • Obliques

Equipment

  • Resistance band

Setup

  1. Secure a resistance band to a low, sturdy anchor point behind you.
  2. Lie on your back with your head toward the anchor point and loop the band around the tops of both feet.
  3. Scoot away from the anchor until there is light tension in the band when your knees are bent at 90 degrees.
  4. Place your hands flat on the floor by your sides or under your glutes for extra lower back support.

How to do it

  1. Exhale and pull your knees toward your chest by contracting your abdominals, resisting the pull of the band.
  2. Continue the movement until your hips slightly lift off the floor for a peak contraction.
  3. Inhale and slowly lower your feet back toward the starting position, maintaining a 90-degree bend in the knees.
  4. Stop just before your feet touch the ground to keep constant tension on the abs.

Form checklist

  • Keep your lower back pressed firmly into the floor at all times.
  • Avoid using momentum or swinging your legs to pull the band.
  • Ensure your neck remains neutral and your shoulders stay relaxed on the floor.
  • Maintain a consistent 90-degree angle at the knees throughout the set.

Pro tips

  • Focus on a posterior pelvic tilt, imagining you are pulling your belly button toward your spine to initiate the lift.
  • At the top of the movement, pause for one second to fight the band's resistance and maximize muscle fiber recruitment.

Make it harder

  • Perform the movement with straighter legs to increase the lever arm and difficulty.
  • Increase the distance from the anchor point to heighten the resistance of the band.

Frequently asked

What muscles does the resistance band lying bent knee raise work?
The resistance band lying bent knee raise primarily targets the abs, and also works the obliques as secondary muscles.
What equipment do you need for the resistance band lying bent knee raise?
The resistance band lying bent knee raise uses resistance band.
Is the resistance band lying bent knee raise good for beginners?
The resistance band lying bent knee raise is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • 3/4 Sit-UpBeginner · abs and obliques
  • 45 Degree Bicycle Twisting CrunchIntermediate · abs and obliques
  • 45 Degree Lean Back Alternate Knee RaiseBeginner · abs and obliques
  • 45 Degrees Arms PlankIntermediate · abs, deltoids, obliques, and pectorals

Train it with Crucible Fit.

Every movement in this library is in the app with video and instructions, ready for your own sessions on the days between Crucibles. Your first Crucible is on us.

Download on the App StoreGet it on Google Play

See how a Crucible works