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  3. Exercises
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  5. Core & Abs
  6. /
  7. Fixed Feet Sit-Up Stand

Exercise guide

Fixed Feet Sit-Up Stand

  • Intermediate
  • Compound
  • Rep-based
  • Lower legs
  • Upper legs
  • Waist

The Fixed Feet Sit-Up Stand is a dynamic compound movement that bridges core strength and lower body power, transitioning from a supine position to a full standing squat. It develops functional coordination and explosive power across the entire anterior chain and core.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Fixed Feet Sit-Up Stand demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Abs
  • Glutes
  • Hamstrings
  • Obliques
  • Quadriceps

Secondary

  • Erector spinae

Equipment

  • Body weight

Setup

  1. Lie flat on your back on a mat with your feet securely anchored under a heavy object, a gym rack, or held by a partner.
  2. Bend your knees at approximately a 90-degree angle with your feet flat on the floor.
  3. Extend your arms straight out in front of you at shoulder height to help with counterbalance.

How to do it

  1. Exhale forcefully and perform a rapid sit-up, driving your torso toward your knees with momentum.
  2. As your chest nears your thighs, immediately shift your weight forward over your mid-foot and drive through your heels to stand up into a full squat completion.
  3. Inhale as you sit back down into a deep squat with control until your glutes touch the floor.
  4. Roll your spine back down to the starting position one vertebra at a time, maintaining core tension.

Form checklist

  • Keep your core braced and spine neutral during the transition from the floor to the stand.
  • Ensure your knees stay tracked over your toes and do not cave inward during the stand-up phase.
  • Avoid rounding your lower back excessively as you reach the top of the sit-up.
  • Maintain a controlled tempo on the way down to maximize eccentric muscle engagement.

Pro tips

  • Lean your torso aggressively forward during the transition; getting your shoulders past your hips is the key to a successful stand.
  • Focus on a 'snap' at the hips during the sit-up phase to generate the momentum needed to clear the floor.
  • Squeeze your glutes hard at the top of the movement to ensure full hip extension.

Make it harder

  • Hold a medicine ball or weight plate at chest height to increase the resistance and shift your center of gravity.
  • Perform the movement without anchoring your feet to significantly increase the demand on your hip flexors and abdominal control.

Frequently asked

What muscles does the fixed feet sit-up stand work?
The fixed feet sit-up stand primarily targets the abs, glutes, hamstrings, obliques, and quadriceps, and also works the erector spinae as secondary muscles.
What equipment do you need for the fixed feet sit-up stand?
The fixed feet sit-up stand requires no equipment — just your body weight.
Is the fixed feet sit-up stand good for beginners?
The fixed feet sit-up stand is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • Barbell Lunge TwistIntermediate · abs, glutes, hamstrings, obliques, and quadriceps
  • Bosu Ball Step-Up High Knee Air TwistIntermediate · abs, calves, glutes, hamstrings, obliques, and quadriceps
  • Elevated Lunge T Spine RotationIntermediate · abs, glutes, hamstrings, obliques, and quadriceps
  • Front Kick TwistIntermediate · abs, deltoids, glutes, hamstrings, obliques, and quadriceps

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.

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