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1.01
StrengthBody weight

Jack knife Floor

Intensity
10–16 reps
MET
4energy expenditure
Type
Strength

Target muscles

  • Abs70%

Supporting muscles

  • Quads
Language:RUEN

How to do it

Keep your head aligned with your spine throughout the entire lift.

  1. 1

    Lie flat on your back with your legs extended and arms extended overhead.

  2. 2

    Simultaneously lift your upper body off the floor while also raising your legs towards the ceiling.

  3. 3

    Try to touch your toes with your fingertips at the top of the movement.

  4. 4

    Slowly lower your arms and legs back to the starting position without letting them touch the floor.

  5. 5

    Repeat for the desired number of repetitions.

Expert tip

Focus on using your abdominal muscles to initiate the movement, and avoid using momentum to lift your torso and legs.

Common mistakes

  • ✕Arching the lower back off the floor
  • ✕Bending the knees during the leg raise
  • ✕Dropping the feet to the floor between reps
Jack knife Floor · 1.01