Jackknife

General And Specifics

• attention: make sure you are warmed up before you start this ab exercise (here you can find our warm-up exercises)

Starting Position

• lay down onto the ground or a mat evenly
• your arms are fully stretched behind your head
• get your feet together

Correct Execution

• brace your abs
• lift your stretched arms, legs and your upper body as high as possible
• avoid curling your back, otherwise your lumbar spine can be strained too much
• let your limbs and upper body sink down again slowly
• repeat the exercise