Bodyweight
3/4 Sit Up
Abs · Core
Intermediate6
Demonstration
IntermediateIsolationBodyweight
Butt Ups
Abs · Core
3
sets
10–12
reps
1m
Rest time
~6
Calories / set
Instructions
- 1
Lie flat on your back with your knees bent and feet flat on the ground.
- 2
Place your hands by your sides, palms facing down.
- 3
Engaging your abs, lift your legs off the ground, bringing your knees towards your chest.
- 4
At the top of the movement, squeeze your abs and pause for a moment.
- 5
Slowly lower your legs back down to the starting position.
- 6
Repeat for the desired number of repetitions.
Muscles worked
Primary
Abs
hip flexors
Secondary
hip flexorslower back
Pro tips
- Move through the full range of motion under control.
- Keep tension on the target muscle — avoid using momentum.
- Breathe out on the effort, in on the return.
- Pick a weight that lets you keep clean form for every rep.
Common mistakes
- Using too much weight and sacrificing technique.
- Rushing reps instead of controlling the tempo.
- Cutting the range of motion short.
- Holding your breath throughout the set.
Safety notes
- Warm up thoroughly before working heavy.
- Stop immediately if you feel sharp or joint pain.
- Use a spotter or safeties for heavy barbell work.
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