How to Do a Plank and How Long to Hold It

How do you do a plank?

1. Kneel on a mat and put your forearms on the floor with your elbows directly under your shoulders. Keep your forearms parallel, or clasp your hands loosely if that feels better.
2. Step your feet back one at a time until your legs are straight, feet about hip-width apart. Wider feet make the hold steadier; feet together make it harder.
3. Squeeze your glutes and tighten your stomach as if someone were about to press on it. Your hips should sit level with your shoulders, not above or below them.
4. Bring your ribs down toward your hips so your lower back does not arch. A small tuck of the pelvis is enough. You should feel your stomach working, not your lower back.
5. Press the floor away through your forearms so your chest does not sink between your shoulder blades. Keep your neck long and your eyes on the floor just ahead of your hands.
6. Breathe in short, steady breaths for the whole hold. If you can stay up only by holding your breath, the variation is too hard for now.

The hold ends when the line ends. Sagging hips, a rising backside or a shift of strain into your lower back means the set is over, even if the clock is still running. The plank exercise page lists the same setup in short steps.

How long should you hold a plank?

Hold each training set for 20–45 seconds with perfect form. That range is a coaching prescription, not a research finding. It works because every second you count is spent in the right position. One long hold where the second half is spent sagging mostly trains you to sag.

For a reference point, Strand and colleagues timed 471 college-age students holding a forearm plank to failure: men averaged 124 ± 72 seconds and women 83 ± 63 seconds. Look at the spreads. Young adults vary widely, and those numbers come from a test held to the limit. They are not a time you must reach before your core counts as strong, and they are not a training target.

Planks also appear in formal fitness testing: the U.S. Army Fitness Test includes a plank event. If you are preparing for a timed test, keep most sessions to clean sets and practise one full timed hold every week or two.

How do you test your starting point?

Warm up with an easy plank on your knees. Rest a minute, then hold a standard forearm plank while someone watches from the side or a phone films you. Stop the timer at the first clear break: hips dropping, hips rising, the lower back arching, or breath-holding to stay up. That number is your clean hold. It tells you more than the time you could survive.

Choose your start from the clean hold:

• Under 20 seconds: train an incline or knee plank, starting with 3 sets of 20 seconds.
• 20–45 seconds: train the standard plank, starting each set about 10 seconds under your clean hold, but never below 20 seconds.
• Over 45 seconds: keep the standard plank as a warm-up and start the long-lever version at 10–15 seconds.

Write down the variation and the start time. You will compare every later session against it.

What are the plank progressions and regressions?

The exit rule counts every set. Holds of 45, 45 and 38 seconds mean stay. When you move up, the clock resets. After a 45-second standard plank, a long-lever plank can feel hard at 15 seconds; that change in difficulty is the point.

The long-lever version earns its place in the ladder. Schoenfeld and colleagues found that a long-lever, posterior-tilt plank raised abdominal activation compared with the standard plank, and that the long lever contributed most of the difference. Moving your elbows forward is the main change; tucking the pelvis under adds to it. Many coaches teach a close relative called the RKC plank, with hard glute tension and the elbows pulled toward the toes.

The side plank works the sides of your trunk rather than the front, so treat it as a second line of practice as well as a step. The side bridge exercise page shows the setup. Reaches and shoulder taps take away one point of support, so your trunk must stop your hips from twisting. Move slowly; a fast tap hides a rocking pelvis.

What does a four-week plank plan look like?

Plank three days a week, such as Monday, Wednesday and Friday. Rest 45–60 seconds between sets. One rule runs through every week: add 5 seconds to the target after a session in which every set held it cleanly, and keep the target after any session with a broken set.

The calendar is a guide, not a rule. If every set reaches 45 seconds in week two, move up in week two. If you miss sessions, repeat the last week you completed. If the first set of a session is worse than usual, drop the target by 5 seconds for that day instead of forcing it.

What plank mistakes should you fix first?

• Sagging hips: The lower back arches and starts to ache. Squeeze your glutes harder, bring your ribs down, and shorten the hold or put your forearms on a bench.
• Hips too high: A raised backside turns the plank into a resting pike. Lower your hips until they line up with your shoulders and heels. A broom handle laid along your back should touch your head, upper back and backside.
• Sinking between the shoulders: Your chest drops and the shoulder blades pinch together. Push the floor away through your forearms.
• Head hanging or craned up: Look at the floor just ahead of your hands so your neck stays in line with your back.
• Holding your breath: Breathe in short, quiet breaths. If you cannot, choose an easier variation.
• Chasing the clock: Shaking from effort is normal. Once the shape changes, though, the set is over, and seconds held in a broken position do not count.

Why does your lower back hurt during a plank?

An aching lower back in a plank usually means your hips have dropped and your lower back is arching, so your spine is taking load that your stomach and glutes should hold. Regress first. Move to an incline or knee plank, tuck your pelvis slightly, squeeze your glutes, and shorten each set to a time you can hold without the ache. The dead bug teaches the same ribs-down, back-flat position while you lie on the floor.

If the pain continues in the easier version, or it feels sharp rather than like a muscle working, stop planking. See a physiotherapist or doctor before you try it again. Sharp pain in a shoulder or elbow is also a reason to end the session.

Do planks flatten your stomach?

Planks strengthen the muscles around your trunk, but they do not burn fat from your stomach in particular. Fat loss depends on your overall eating and activity, and you cannot choose where it comes off first. The ab exercises hub has more trunk exercises if you want variety beyond the plank.

How often should you plank, and where does it fit?

Two to four sessions a week is plenty for most people. ACSM's position stand on resistance-training progression recommends two to three days a week for novices, with difficulty raised gradually. Easy planks on extra days are fine if your next session is not worse. Harder versions need rest days like any other strength work.

Put planks after your main exercises, not before squats or push-ups, so a tired trunk does not weaken your heavier work. A straight-arm plank is also the top position of a push-up, so holding that line carries over to pressing. Planks sit in the core group of the calisthenics hub, first in line before the hollow hold, L-sit and front lever.

How do you track plank times?

Write down the variation, the seconds for every set, and whether each set ended clean. “Standard plank: 40, 40, 33, hips dropped” tells you to repeat 40. “Standard plank: 45, 45, 45” on two sessions tells you to try the long lever.

Logging is free in Trainer, and planks are logged in seconds. Every set arrives pre-filled with the seconds to hit next, and that target rises 5 seconds when every set holds it.

Once a long-lever plank is solid, the next core skill is the hollow body hold. It keeps the same ribs-down position but lies face up, with your arms and legs as the lever. After that, the L-sit adds support strength and the front lever takes the same body line under a bar.

Sources

• Strand et al., 2014. Norms for an isometric muscle endurance test. J Hum Kinet
• U.S. Army, 2026. ATP 7-22.01 Holistic Health and Fitness Testing
• Schoenfeld et al., 2014. An electromyographic comparison of a modified version of the plank with a long lever and posterior tilt versus the traditional plank exercise. Sports Biomech
• ACSM, 2009. Progression models in resistance training for healthy adults. Med Sci Sports Exerc