Abdominals · No equipment
Jack Knife Floor
Abs exercise with no equipment. Works the abs.
The same demo you get in the app. Tap any exercise there for its stats and history.
How to do it
Jack Knife Floor, step by step
- 01
Lie flat on your back with your arms stretched overhead and your legs straight.
- 02
Press your lower back into the floor and brace your stomach.
- 03
Lift your straight legs and upper body at the same time.
- 04
Reach your hands toward your feet, folding at the hips like a jackknife.
- 05
Lower everything back down slowly without letting your back arch.
Jack Knife Floor in Trainlike
Progress in reps, not guesses.
With nothing on the bar, reps are the target. Match your best and the next workout asks for one more.
Fall short and Trainlike eases the reps back instead of the weight, then rebuilds from there. Every verdict opens the receipt behind it.
How verdicts work in the user guide.
Train it, get it graded.
Log the Jack Knife Floor in Trainlike and every workout comes back with a grade, the evidence, and your next target.
First three workouts free, insights included.
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