LiftSetsLiftSets / Exercises / Jackknife Sit-Up
Jackknife Sit-Up
Works the abdominals.
Bright blue is the target muscle. Darker blue is helping. The app shows this as a moving demo.
Muscles worked
abdominals
How many reps
| Goal | Reps per set |
|---|---|
| Strength | 3-6 |
| Muscle size | 6-10 |
| Endurance | 12-20+ |
Whatever the number, the set should end within a rep or two of the point where you could not do another with good form.
| Kit | Body only |
|---|---|
| Level | Beginner |
What to think about
- Arms and legs stay long.
- Fold at the hips, hands reach for the feet.
- Lower slowly, no flopping back.
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.
Other exercises for the abdominals
- 3/4 Sit-Up
- Ab Roller
- Barbell Ab Rollout - On Knees
- Bent-Knee Hip Raise
- Butt-Ups
- Cable Crunch
- Crunch - Hands Overhead
- Crunches
Track it in LiftSets
Log Jackknife Sit-Up with last time's numbers in front of you, a rest timer on your lock screen and a graph of your progress.
Coming soon to the App Store