Jack Knife (Suspension)
Trains the abdominals. You need a suspension. None of our programs use it yet, but you can add it to any session you build.
Free to use. The app works out every weight and times your rest.
In the programs
None of our programs use the Jack Knife (Suspension)
It is in the app, so you can add it to any session and log it like anything else. It is just not written into one of our 50 free programs. If you want a abdominals exercise that is, there are 9 on the Abdominals page.
Muscles worked
What Jack Knife (Suspension) trains
Technique
How to do the Jack Knife (Suspension)
- Set the suspension trainer straps to about mid-calf height. Place your feet in the foot cradles and assume a plank position with your hands on the floor directly under your shoulders.
- Keeping your arms straight and your core engaged, pull your knees toward your chest, letting your hips rise slightly.
- Pause briefly with your knees tucked in, feeling the contraction in your abdominals.
- Extend your legs back to the plank position with control. Repeat for the desired number of repetitions.
Form cues
Getting it right
- Keep your shoulders stacked over your hands throughout the movement.
- Avoid letting your hips sag in the plank position; keep your core braced.
- Perform the movement slowly and with control rather than swinging your legs.
- Exhale as you tuck your knees in and inhale as you extend back to the plank.
Substitutes
Swap Jack Knife (Suspension) for
The app's swap picker ranks these the same way: same muscles, similar movement, similar equipment.
Let the app run the Jack Knife (Suspension) for you
Durata picks the weight, times your rest and adds load when you earn it. That works on any of our 50 free programs, or on a session you put together yourself.