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Curl-Up (Crunch) Test

Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 2 min read
muscular-endurancecurl-upcrunchcoreabdominaltestcadence

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In one line

Cadence-paced partial sit-ups (curl-ups) done in time with a metronome until you can't keep pace or hit a cap; the count rates abdominal/core endurance and avoids the hip-flexor-loaded full sit-up.

Detail

The curl-up (crunch) test assesses abdominal muscular endurance. The partial curl is preferred over the full sit-up because full sit-ups recruit the hip flexors (iliopsoas) and load the lumbar spine (iliopsoas-lordosis-situp).

ACSM/CSEP protocol: lie supine, knees bent ~90°, feet flat (unanchored), arms at sides. Tape or markers are placed so fingertips slide a set distance (commonly 8–12 cm, depending on protocol). Curl the trunk up to slide the fingertips the set distance (shoulder blades clear the mat), then lower. Move to a metronome cadence of ~25 curl-ups per minute (one every ~2 s; 50 beats/min: up on one beat, down on the next). Continue until the participant breaks cadence, uses poor form, or reaches a cap of 75–100 reps (protocol-dependent). Record the count.

Note: several curl-up/sit-up protocols exist (timed 1-minute sit-up tests, FitnessGram cadence curl-ups); norms are protocol-specific, so keep the method constant.

Key facts

  • Measures abdominal/core endurance; preferred over full sit-up (less hip-flexor/lumbar load).
  • Knees ~90°, feet unanchored; fingertips slide a set distance (~8–12 cm).
  • Cadence ~25/min (one every ~2 s); stop on broken cadence/form or cap (75–100 reps).
  • Many variants exist — norms are protocol-specific; hold method constant for re-tests.

Connections

  • plank-test — isometric core-endurance alternative.
  • push-up-test — companion upper-body endurance test.
  • iliopsoas-lordosis-situp — why partial curls beat full sit-ups.
  • muscular-endurance-norms — interpret the count.
SourceCurrent guideline bodies
ACSM's Guidelines for Exercise Testing and Prescription (10th/11th ed.); Canadian Physical Activity, Fitness & Lifestyle Approach (CPAFLA) curl-up protocol.
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

Explore related topics

Atlas Connections

Rectus Abdominis
The "abs"; a long strap-like trunk flexor split into left/right halves by the linea alba.
Muscular Endurance Norms (Push-Up / Curl-Up)Closely related
Age- and sex-specific reference tables turn a raw push-up or curl-up count into a category (needs improvement → excellent); counts decline with age and differ by sex/protocol.
Plank Hold Test (Core Endurance)Closely related
Hold a forearm plank with a neutral spine for as long as possible; the time to failure rates isometric core/trunk endurance with minimal spinal loading.
Push-Up Test (Muscular Endurance)Closely related
Do as many consecutive good-form push-ups as possible (men on toes, women on knees per the ACSM protocol); the count rates upper-body muscular endurance against age/sex norms.
Crunches
The basic spinal-flexion abdominal exercise placed in the "contracted" position of the Positions-of-Flexion abs chart; targets the rectus abdominus.
Iliopsoas, Lumbar Lordosis & Sit-Up Lower-Back Caution
Tight hip flexors increase lumbar lordosis and low-back strain; straight-leg sit-ups and leg raises work the hip flexors and, with too much upward movement, can cause lower-back problems instead of abdominal tone.