Form guide · Plank
How to Do a Proper Plank
The plank is the simplest core exercise to start and the easiest to do badly. Holding it longer doesn't help if your hips have quietly dropped — position is everything.
A plank is a held position, not a movement, which means there are no reps to count and no obvious feedback when your form slips. People chase longer hold times while their hips sag toward the floor — at which point the core has stopped working and the lower back is taking the strain.
A great plank is short, tight, and honest: a straight line from head to heels with everything braced. This guide covers how to set that line, what to actively squeeze, and how to fix the two faults that ruin most planks — sagging and piking.
How to do it, step by step
- 1
Set your base
Place your forearms on the floor shoulder-width apart, elbows directly under your shoulders. Make fists or press your palms flat.
- 2
Extend into a straight line
Step your feet back so your body forms one straight line from the top of your head to your heels. Look at the floor just in front of your hands to keep your neck neutral.
- 3
Brace everything
Squeeze your glutes, pull your belly button toward your spine, and tighten your quads. Imagine bracing your abs for a light punch. This is the difference between a real plank and just hanging there.
- 4
Hold the line
Keep breathing steadily while holding the position. Your hips should stay level with your shoulders and heels — not dropping down and not riding up.
- 5
Stop before form breaks
End the hold the moment your hips start to sag or pike. A 20-second plank with a perfect line beats a 90-second plank that collapses halfway through.
What Tip Top's AI checks
Hips level with shoulders and heels. Dropping = sagging; rising = piking.
Tip Top Fitness's AI measures the angle at your hip (shoulder–hip–ankle) the whole time you hold. If your hip drops below the straight line, it cues "lift your hips — keep your body in a straight line." If your hips pike up, it cues "lower your hips — don't pike up." Because it's watching continuously, it catches the slow sag that creeps in as you fatigue — the exact moment your plank stops doing its job.
Try a form check freeMuscles worked
Primary
- Core (rectus abdominis, transverse abdominis)
- Obliques
Supporting
- Shoulders
- Glutes
- Quads
Common mistakes (and how to fix them)
Sagging hips
The most common plank fault. As you tire, your hips drift toward the floor, your lower back arches, and your core disengages. The fix is to squeeze your glutes and brace your abs hard — and to end the hold when you can no longer keep the line.
Piking the hips up
Lifting your hips into an inverted V makes the plank easier by shifting weight onto your shoulders and out of your core. Drop your hips back to level so your body is one straight line from head to heels.
Chasing time over position
Long hold times are a vanity metric if the position falls apart. Thirty honest seconds of full tension builds more core strength than minutes of a sagging hold. Track quality first.
Letting the head drop or crane
Looking up strains the neck; letting the head hang breaks the line. Keep your gaze at the floor just ahead of your hands so your neck stays in line with your spine.
Why it's worth training
- Builds deep core stability that carries over to every other lift and to posture.
- No equipment and low impact — suitable for almost anyone, anywhere.
- Trains the core to resist movement (anti-extension), which is what it does in real life.
- Strengthens shoulders and glutes as supporting players in the hold.
Frequently asked questions
How long should I hold a plank?
Hold for as long as you can keep a perfectly straight line — for many people that's 20–45 seconds. Stop the moment your hips sag or pike. Several short, high-quality holds beat one long hold with broken form.
Why do my hips sag during a plank?
Usually fatigue plus not actively bracing. Squeeze your glutes and tighten your abs to hold the line, and end the set when you can't. Continuous form feedback can tell you the instant your hips drop below the line, which is hard to feel yourself.
Forearm plank or high plank?
Both are effective. The forearm (low) plank is the standard for core work; the high plank (on your hands) adds more shoulder and triceps involvement. Use whichever lets you keep a straight, braced line.
Are planks enough for abs?
Planks build excellent core stability, but a well-rounded core routine also includes some movement-based work (like dead bugs or leg raises) and, for visible abs, attention to overall body fat. The plank is a foundation, not the whole program.
Stop guessing about your plank form.
Tip Top Fitness watches every rep through your phone camera, counts them, and tells you the one thing to fix — in real time.
Try the beta freeMore form guides