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Also known as: Flat knee raises.

Technique

  1. Lie flat on the ground with the arms extended over the head.
  2. Bend the knees and bring the legs towards your torso, lifting your butt off the ground.
  3. Return to the starting position with the legs straight hovering the floor.

Form tips

  • Do not let your back arch when extending your legs.
  • Keep control of the pelvis when lowering your butt to the ground.

Muscles

Strength

Primary

  • Abs
  • Obliques
  • Pelvis
  • Quadriceps

Secondary

  • Hip adductors
  • Rectus abdominis
  • External oblique
  • Internal oblique
  • Iliacus
  • Rectus femoris
  • Psoas major

Equipment

Appears in

Joint movements
Trunkflexion
trains stretches

Progressions

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Straight-leg reverse crunch

Novice
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Double crunch

Novice
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Cross body crunch

Novice
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Stability ball bicycles

Novice

Regressions

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Lying leg extension

Beginner
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Lying legs raise

Beginner
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Tuck-up

Beginner
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Butt walk

Beginner
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Roll up

Beginner
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Sitting leg extensions

Beginner
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