Jackknife sit-up
How to do the Jackknife sit-up: full step-by-step instructions, muscles worked (Core), equipment (Bodyweight) and a two-frame demo. Free to read, from the Setline exercise catalog.
How to do it
- 1
Lie on your back, arms extended behind your head, legs extended.
- 2
Bend at the waist while raising your legs and arms to meet in a jackknife position, torso off the floor.
- 3
Lower your arms and legs back to the starting position.
In a Setline session: 3 sets of 10–12.
Questions
What equipment do I need for the Jackknife sit-up?
The Jackknife sit-up uses: Bodyweight.
Which muscles does the Jackknife sit-up work?
The Jackknife sit-up works: Core.
How many sets and reps for the Jackknife sit-up?
In Setline sessions the Jackknife sit-up is programmed as 3 sets of 10–12.
Which Setline styles include the Jackknife sit-up?
The Jackknife sit-up appears in: Bodyweight.
Related exercises
Want these arranged into tonight’s session?
Three questions — your gear, your style, your minutes. One session, played daily.