Liftworthy
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Liftworthy

Every exercise ranked by research, by lifters and by results. Find what’s S-tier for your goal, then train it.

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General training information, not medical advice. If something hurts, stop and see a professional.
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Explore/Abs

Crunch

BodyweightIsolationEasy to learn
Front
Back
Primary

Works

Abs

You need

Nothing but the floor

How to do itPictures · 3 steps
1Start
2Top
Main muscles
  1. 1Lower back on the floor
  2. 2Curl your ribs toward your pelvis
  3. 3Pause at the top

Most common mistake

Hundreds of fast reps with no added load.

Watch a demo

Compare with

vs Reverse Crunchvs Toes-to-Barvs Hanging Knee Raise
C
For abs
#11 of 23
See the full list →
Research
53
Scored by hand
Results
Soon
From the app
How lifters rate itBe the first
S
A
B
C
D
F
Why research scores it 53
Target tensionStrong
Loaded stretchFair
ProgressionWeak
Low costExcellent

Research behind these criteria

  • Target tension: Zabaleta-Korta et al., 2021 · Kinoshita et al., 2023
  • Loaded stretch: Maeo et al., 2021 · Maeo et al., 2023 · Pedrosa et al., 2022 · Kassiano et al., 2023
  • Progression: Plotkin et al., 2022 · Pelland et al., 2026
  • Low cost: Schoenfeld et al., 2021 · Refalo et al., 2023
How scores work

Machine taken? Swap to

  • SCable CrunchCable
  • SMachine CrunchMachine
  • AAb Wheel RolloutOther
  • AHanging Leg RaiseBodyweight

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