Jackknife Sit-Up
Works the abs.
- Primary muscles
- Abs
- Equipment
- Body only
- Level
- Beginner
- Mechanic
- Compound
- Force
- Pull
How to do it
- 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.
- 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.
- While inhaling, lower your arms and legs back to the starting position.
- Repeat for the recommended amount of repetitions.
Track it
Log every set in Pensum. It keeps your best sets and estimates your one-rep max as you go. Estimate your 1RM now.
More Abs exercises
- 3/4 Sit-Up Body only
- Air Bike Body only
- Alternate Heel Touchers Body only
- Bent-Knee Hip Raise Body only
- Bottoms Up Body only
- Butt-Ups Body only
- Cocoons Body only
- Cross-Body Crunch Body only