▸ Core
Jackknife Sit-Up
AbdominalsBody Only
beginner · compound · strength
A abdominals movement in the Bikkel catalog. Load it into a routine and log every working set — weight, reps and rest tracked like an equipment readout.
▸ How to
Own the movement
Step-by-step form cues to get you started. Dial in the exact working weights and rep targets inside the app.
01
Lie flat on the floor (or exercise mat) on your back with your arms extended straight back behind your head and your legs extended also. This will be your starting position.
02
As you exhale, bend at the waist while simultaneously raising your legs and arms to meet in a jackknife position. Tip: The legs should be extended and lifted at approximately a 35-45 degree angle from the floor and the arms should be extended and parallel to your legs. The upper torso should be off the floor.
03
While inhaling, lower your arms and legs back to the starting position.
04
Repeat for the recommended amount of repetitions.