Training· 3 min read
Floor crunch: setup, technique and progression
Other names: Partial curl-up
A floor crunch curls the upper torso from a lying position with the knees bent. It stops before a full sit-up. Choose a comfortable head position and a controlled short range rather than pulling on the neck or chasing a fixed lift height.
Certified fitness coach · CQP Instructeur Fitness
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The essentials before you start.
- Choose secure support and a manageable starting demand.
- Describe the intended trunk, hip and pelvic movement.
- Record lever, range and counting method consistently.
- Research measurements do not establish every variation or a local-fat-loss promise.
Exercise facts
- Main muscles
- Rectus abdominis
- Secondary muscles
- External and internal obliques, Transversus abdominis, Hip flexors
- Equipment
- Bodyweight, Exercise mat
What the movement trains
The rectus abdominis and other abdominal muscles contribute to curling the trunk. Hip-flexor demand differs from a full sit-up but is not necessarily absent. A shorter task is not automatically better for every person.
Set up and perform the movement
- Lie on a comfortable mat with the knees bent and feet securely supported.
- Cross the arms over the chest or rest the fingertips lightly near the ears without pulling the head.
- Set a comfortable head and pelvic position; a fixed fist-sized chin gap is not required.
- Curl the upper torso to lift the shoulder blades through a manageable range, breathing out as helpful.
- Lower smoothly without dropping the head or bouncing into the next repetition.
- Rest when the intended range or neck comfort changes rather than forcing extra repetitions.
Range, support and control
The movement does not require a fixed number of centimetres or a forceful lower-back press. Loaded, oblique and combined leg-raise versions change the task. A weight held securely at the chest is different from an unsecured load near the face.
What the cited research supports
The small activity and modelling studies compared particular crunch and sit-up tasks. Modelled spine compression is not an injury-rate prediction. The six-week trial improved curl-up endurance without reducing the measured abdominal-fat outcomes; it did not establish a growth ranking for every crunch variation.
Variations and alternatives
A sit-up continues towards sitting. A cable crunch, ball crunch or hollow body crunch changes resistance or support.
Sets, progression and tracking
An example is 2–4 sets of 8–20 controlled repetitions with adequate rest. Record the range, arm position and effort. Hundreds of fast repetitions are not required to make the task useful.
Illustrated positions and options
The images show example positions rather than an individual range, loading or breathing prescription. Use suitable equipment and a controlled return.
Illustrated option 1
Frequently asked questions
Does a crunch remove fat from the waist?
The cited six-week abdominal-training trial did not reduce the measured abdominal-fat outcomes. Do not treat a local muscle task as a promised local fat-loss method.
When should I add demand?
When the intended support, range and effort remain repeatable and the next change is manageable. Record changes rather than comparing different levers as if they were identical.
Sources and limitations
Sources support the passages that cite them. Practical suggestions are coaching choices to adapt to your own situation.
- Axler and McGill · 1997 · Activity and modelled lumbar loading across twelve abdominal tasks in nine volunteers. ↗
Mechanical estimates and brief testing, not later injuries, pain outcomes or a universal safest exercise.
- Escamilla et al. · 2006 · Acute activity comparison of traditional and device-based abdominal tasks in twenty-one adults. ↗
Specific Power Wheel, strapped knee-up, inclined reverse-crunch and floor tasks; not every commercial device, later growth or injury outcomes.
- Vispute et al. · 2011 · Six-week abdominal-exercise trial in twenty-four sedentary adults. ↗
Curl-up endurance improved without significant changes in the measured abdominal-fat outcomes; not every exercise or combined lifestyle intervention.
This general information does not replace individual advice. Zepraug’s limitations.
