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  7. Sitting Frog Crunch On A Padded Stool

Exercise guide

Sitting Frog Crunch On A Padded Stool

  • Intermediate
  • Compound
  • Rep-based
  • Waist

The Sitting Frog Crunch targets the entire abdominal wall and hip flexors by utilizing a wide-knee position to increase lower-ab engagement. Performing this on a stool allows for a greater range of motion and challenges your core stability more than floor variations.

Reviewed by the Crucible team · Updated June 2026

Watch the Sitting Frog Crunch On A Padded Stool demonstrationGuided video and your full workout live in the Crucible app.

Muscles worked

Primary

  • Abs
  • Obliques

Secondary

  • Hip flexors

Equipment

  • Body weight

Setup

  1. Sit on the edge of a padded stool or bench, gripping the sides just behind your hips for support.
  2. Lean your torso back to a 45-degree angle while maintaining a flat back and neutral spine.
  3. Lift your feet off the ground, bringing your heels together and pointing your knees outward in a 'frog' position.

How to do it

  1. Inhale and extend your legs straight out in front of you, keeping your heels together and knees turned out.
  2. Exhale as you pull your knees back toward your chest, simultaneously crunching your upper body slightly forward to meet them.
  3. Maintain a controlled 2-1-2 tempo, focusing on the deep contraction in the lower abdominals.
  4. Keep your core braced throughout the entire range of motion to protect your lower back.

Form checklist

  • Keep your heels glued together throughout the entire movement.
  • Ensure your lower back does not arch excessively as you extend your legs.
  • Keep your chest open and shoulders pulled back and down.
  • Avoid using momentum or swinging the legs; use the abs to drive the movement.

Pro tips

  • At the peak of the contraction, squeeze your heels together hard to further activate the lower abdominals and pelvic floor.
  • Maintain a slight 'hollow body' position even at full extension to keep constant tension on the core muscles.

Make it harder

  • Release your hands from the stool and hold them out to your sides to remove the stability assist and force the core to balance the body.
  • Slow down the eccentric phase (leg extension) to four seconds to increase time under tension.

Frequently asked

What muscles does the sitting frog crunch on a padded stool work?
The sitting frog crunch on a padded stool primarily targets the abs and obliques, and also works the hip flexors as secondary muscles.
What equipment do you need for the sitting frog crunch on a padded stool?
The sitting frog crunch on a padded stool requires no equipment — just your body weight.
Is the sitting frog crunch on a padded stool good for beginners?
The sitting frog crunch on a padded stool 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 this with a plan, not guesswork

Crucible builds the sitting frog crunch on a padded stool into a precise program around your body, equipment, location, and time.

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