Front plank
Also called plank, forearm plank, prone plank.
What is a front plank?
A front plank is a bodyweight hold performed face down with your weight on your forearms and toes. You lift your knees and hips from the floor and keep your head, trunk and legs in one long line. The rectus abdominis is the clearest main target. You maintain the position rather than moving through repeated lifting and lowering phases.
How do you perform a front plank?
Set up
- Lie face down, place your forearms on the floor, and set your elbows under your shoulders.
- Extend your legs behind you, tuck your toes under at a comfortable width, and brace your abdomen and glutes.
Execution
- Press through your forearms and toes to lift your knees and hips from the floor.
- Hold one long line from your head through your hips to your heels while you continue to breathe.
- End the hold when you cannot keep that position, then lower your knees and hips to the floor with control.
Common mistakes
Letting the hips sink
The hold has changed once the pelvis drops and the lower back arches. Finish the set or use an easier variation before that position appears.
Lifting the hips high
Raising the hips shortens the lever and turns the straight-body hold into a different position. Lower them until the trunk and legs form one long line.
Collapsing between the shoulders
Letting the chest sink makes the upper-body support less steady. Press the floor away through both forearms and keep the shoulders away from the ears.
Holding the breath
Bracing does not require one long breath hold. Keep the abdomen firm while taking small, regular breaths, and end the set if you cannot do both.
Where it fits in a session
Use it wherever a short trunk-stability exercise fits: during a bodyweight session, alongside other core work or after the main lifts.
Treat the position, not the clock, as the limit. Use a knee or incline plank if the full version changes shape immediately; choose a harder variation only after the standard hold stays steady.
Muscles worked
Primary
Secondary
- None listed in this guide
Schematic surface view. Some muscles are partly visible or not shown.
The required movement references agree that the abdominals are the main target, with rectus abdominis named specifically, but their secondary lists do not agree. The first-pass guide therefore keeps only the shared main target instead of turning every muscle that helps hold the position into a listed training target.
Scientific studies on the front plank
Plank research often measures muscle activity or the immediate response to a hold. Those measurements can explain differences between variations, but they do not establish which version builds more muscle.
Moving the elbows forward increases the abdominal activity measured in a plank. Longer holds also feel harder, but the studies below do not establish a best hold time. Keep the guide’s position-based stopping rule rather than chasing a research protocol’s duration.
What changes when the elbows move forward?
In 19 participants, a plank with a longer lever increased activity in the upper rectus abdominis and the area described by the researchers as the lower abdominal stabilizers. Combining that position with a backward pelvic tilt also increased external-oblique activity compared with the traditional plank.
This supports treating a deliberate long-lever plank as a different challenge. The experiment compared 30-second holds and measured electrical activity, not muscle growth, injury risk or long-term strength.
Sources
Does a longer hold produce better results?
A study of 15 trained adults compared one-, two- and three-minute forearm planks in a single session. Perceived effort increased with duration. The researchers also measured abdominal thickness immediately after the holds, which is not a test of muscle growth over weeks.
These findings do not establish an optimal hold time or show that a three-minute plank produces better training results. The participants were already familiar with planks; their test durations are not minimum targets for a beginner.
Variations
- Knee front plank — Keep the same forearm support but place the knees on the floor to shorten the lever.
- Incline front plank — Rest the forearms on a stable bench or raised surface while the feet stay on the floor.
- High plank — Support the upper body on straight arms and hands instead of the forearms.
- Long-lever plank — Move the elbows slightly farther in front of the shoulders while keeping the same body line, increasing the demand without adding weight.
Related tools
Frequently asked questions
What muscles does a front plank work?
The rectus abdominis is the clearest main target. Other muscles around the body help hold it still, but reference lists disagree on which of those should count as secondary targets. The guide keeps the target list conservative rather than presenting every stabilizer as a muscle the exercise trains equally.
How long should I hold a front plank?
There is no single useful duration for everyone. Hold only while your hips, ribs and shoulders stay in the same position and you can keep breathing. When the shape changes, end the set or use an easier version that lets you practise a steady position.
Should my feet be together or apart?
Either can work. A wider stance gives you a broader base, while bringing the feet closer gives you less side-to-side support. Start at a comfortable width and keep both feet still rather than treating one exact spacing as mandatory.
Where should my elbows be in a front plank?
Start with each elbow under its shoulder and the forearms resting on the floor. That gives you a simple, repeatable support position. Moving the elbows farther forward creates a longer-lever variation and should be logged or treated as a deliberate progression rather than accidental drift.
Why do my hips sag during a plank?
The hold has reached the point where you can no longer keep the trunk and legs aligned. End the set before the sag grows, or switch to a knee or incline plank so you can practise the same shape with a shorter lever.
Is a high plank the same exercise?
It is a close variation, but the support changes from the forearms to straight arms and hands. This guide and illustration describe the forearm version represented by the Realm front-plank entry.
Sources
- Oliva-Lozano JM, Muyor JM. Core Muscle Activity During Physical Fitness Exercises: A Systematic Review. Int J Environ Res Public Health. 2020. https://pmc.ncbi.nlm.nih.gov/articles/PMC7345922/
- Schoenfeld BJ et al. Long-lever and posterior-tilt plank comparison. 2014. https://pubmed.ncbi.nlm.nih.gov/25325773/
- Al Sheikh Aleais D et al. Acute dose-response of forearm-plank duration. 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC9365105/