Bodyweight
3/4 Sit Up
Abs · Core
Intermediate6
Demonstration
BeginnerIsolationBodyweight
Lying Elbow To Knee
Abs · Core
3
sets
12–15
reps
45s
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 behind your head with your elbows pointing outwards.
- 3
Engage your abs and lift your upper body off the ground, bringing your right elbow towards your left knee.
- 4
At the same time, extend your right leg straight out and lift it off the ground.
- 5
Pause for a moment, then return to the starting position.
- 6
Repeat the movement, this time bringing your left elbow towards your right knee and extending your left leg.
- 7
Continue alternating sides 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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