Not sure how to perform the low-abs jackknife exercise correctly?

Here are the two most common mistakes a trainer sees on the regular.

Jackknives also happen to be one of the most technically challenging core exercises out there.

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If youre not quite sure that youve achieved A+ form yet, never fear.

Never heard of a jackknife?

Heres how it goes: Lie down and fully extend your arms overhead.

Two young women practicing ballet with a teacher in the dance hall.

Nike Master Trainer, yoga instructor, and fitness model

(you’re free to also keep your legs bent, if this feels better.)

(Of course, itswayharder this way, but are you really surprised?)

Just keep your two cues in mind: Core engaged!

Woman doing hip exercises

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Woman in leggings and bra doing Lunge with Arm Extended Up pose hip opener stretch during yoga session in morning at home.

Woman doing arm exercise without weights while sitting on mat at home.

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