Side Jackknife

AbsBodyweightBeginnerCompound

Side Jackknife — finish position — Finish

Muscles worked

PrimaryAbs

In the app

Side Jackknife needs no kit, so it appears whenever the day's window has room for it. Its minutes come from Rule 2 (Sessions are built to fit, never guaranteed, graded product): the window sets how long it runs, never the other way round.

If a machine is taken the engine swaps a same-pattern movement and says why.

Join the waitlist

Same pattern, with kit

Same movement pattern, same primary muscles — swap by what you have.

With other

Ab Roller

With bodyweight

Cross-Body Crunch Russian Twist Crunches Decline Crunch Flat Bench Lying Leg Raise Hanging Leg Raise

With machine

Ab Crunch Machine

With cable

Cable Crunch

More abs exercises

Ab Crunch MachineMachineIntermediate

Ab RollerOtherIntermediate

Cable CrunchCableBeginner

Cross-Body CrunchBodyweightBeginner

CrunchesBodyweightBeginner

Decline CrunchBodyweightIntermediate

All abs exercises ›

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