Plank
The plank is an isometric hold: elbows down, body in one line, nothing moving while time and fatigue try to fold you. It trains your abdominals to keep your spine steady under load, with your glutes and shoulders pitching in. It suits beginners building their first core strength and lifters who want a trunk that doesn't leak force during squats and presses.
Why it works
Because nothing moves, the plank isolates one job: refusing extension at the spine. Gravity pulls your hips toward the floor for the entire hold, and your abdominals, working with your glutes, resist without a single rep to hide behind. That stubborn stillness is a skill. It's the same stiffness you need when a barbell sits on your back or a grocery bag hangs off one arm, which is why such a plain-looking hold keeps earning a spot in serious programs.
Set up
- Kneel on a mat and set your elbows on the floor, stacked directly under your shoulders.
- Forearms parallel, hands relaxed, not clasped in a death grip.
- Step both feet back until your legs are straight and your toes are tucked.
How to do it
- Walk your feet back until shoulders, hips, and ankles form one straight line.
- Tuck your pelvis slightly, as if pulling your belt buckle up toward your ribs.
- Squeeze your glutes and quads so your legs share the load.
- Press the floor away through your forearms so your upper back doesn't sag between the shoulder blades.
- Fix your eyes on the floor about a hand's width ahead of you to keep your neck long.
- Hold that shape, breathing steadily, and end the set the moment the line starts to break.
Form cues
- Belt buckle to ribs.
- Glutes tight, quads tight.
- Push the floor away, don't hang between your shoulders.
- One line from head to heels.
Breathing: Keep breathing the entire hold with short, even breaths in through the nose and out through the mouth; a held breath means the set is already over.
Common mistakes
Hips drooping toward the floor as the seconds add up.
Fix: Re-squeeze your glutes and re-tuck your pelvis the instant you feel the sag, and end the set when you can't get it back. A sagging plank trains your lower back to ache, nothing else.
Hiking the hips up into a tent to make the hold easier.
Fix: Lower your hips until shoulders, hips, and ankles line up again; a shorter honest hold beats a long tented one.
Craning the head up to look at the wall.
Fix: Drop your gaze to the floor just ahead of your hands so your neck stays in line with the rest of your spine.
Chasing minutes on the clock with a shaking, collapsing body.
Fix: Cap holds at the point where form breaks, and make the exercise harder instead of longer once you pass about a minute.
How to program it
- Start with 3 or 4 holds of 15 to 30 seconds, resting about a minute between them, two or three days a week.
- Add roughly 5 seconds per week instead of chasing one long max hold; consistent clean sets build more than a weekly ordeal.
- Once you hold 60 clean seconds, progress the exercise rather than the timer: lift one foot, narrow your base, or move to a harder variation.
- Slots naturally at the end of a session as core work, or early as a bracing rehearsal before squats and presses.
Safety notes
- The work belongs in your abs; if you feel it mostly in your lower back, rest and restart with a stronger pelvic tuck and a shorter hold.
- On sore wrists this forearm version is the friendly one; there's no need to plank on straight arms.
Exercise profile
- Force
- Static
- Mechanics
- Isolation
- Laterality
- Bilateral
- Category
- Strength
Frequently asked questions
How long should I hold a plank?
Only as long as your body stays in one line. For most beginners that's 15 to 30 seconds, repeated 3 or 4 times. A sagging two-minute hold trains nothing but your patience.
Is a plank better than sit-ups?
They do different jobs. The plank teaches your trunk to stay rigid, which transfers to lifting and posture; sit-ups train your spine to flex repeatedly. If you only pick one, most people get more from the plank, and lower backs tend to prefer it too.
Should I plank every day?
You can, since the load is light, but three or four quality sessions a week with gradual progression will take you further than a daily obligation hold.
Why does my lower back hurt when I plank?
Almost always because the hips have sagged and the lower back is holding the position instead of the abs. Tuck your pelvis, squeeze your glutes, and shorten the hold to whatever length you can keep flat. If pain shows up even in short, clean holds, get it checked.
Do planks burn belly fat?
No single exercise burns fat from one spot. Planks strengthen the muscles underneath; visible change comes from your overall training and eating pattern over months.