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  3. Exercises
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  5. Core & Abs
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  7. Lying Leg Raise Modified

Exercise guide

Lying Leg Raise Modified

  • Beginner
  • Compound
  • Rep-based
  • Waist

This beginner-friendly core exercise targets the lower abdominals and hip flexors while minimizing lower back strain by working one leg at a time. It builds foundational core stability and hip control through a controlled, alternating range of motion.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Lying Leg Raise Modified demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Abs

Secondary

  • Obliques

Equipment

  • Body weight

Setup

  1. Lie flat on your back on a mat with your legs extended straight and arms by your sides.
  2. Press your lower back firmly into the floor to engage your core and eliminate any arching.
  3. Place your hands palms-down under your glutes for additional lower back support if needed.

How to do it

  1. Exhale as you lift one leg toward the ceiling, keeping it straight, until it is roughly perpendicular to the floor.
  2. Inhale as you slowly lower the leg back down to the starting position, stopping just before it touches the ground.
  3. Repeat the movement with the opposite leg, alternating sides for each repetition.
  4. Maintain a controlled tempo, taking approximately 2 seconds to lift and 2 seconds to lower.

Form checklist

  • Keep the lower back glued to the floor throughout the entire movement.
  • Ensure the non-working leg remains stationary and pressed into the mat.
  • Avoid using momentum; move the leg with control from the hip.
  • Keep your neck relaxed and gaze toward the ceiling to avoid strain.

Pro tips

  • Focus on 'pulling' your belly button toward your spine to maximize deep transverse abdominis engagement.
  • At the top of the movement, give your quad a quick squeeze to ensure full leg extension and hip flexor activation.

Make it harder

  • Keep both feet hovering 2-3 inches off the ground throughout the entire set instead of resting the non-working leg.
  • Slow down the lowering phase to 4 seconds to increase time under tension for the lower abs.

Frequently asked

What muscles does the lying leg raise modified work?
The lying leg raise modified primarily targets the abs, and also works the obliques as secondary muscles.
What equipment do you need for the lying leg raise modified?
The lying leg raise modified requires no equipment — just your body weight.
Is the lying leg raise modified good for beginners?
Yes. The lying leg raise modified is a beginner-friendly movement and a strong foundation to build on.

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.

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