How to Do a Plank
Hold a forearm plank with correct form, fix sagging or piked hips, and build from a few seconds to a solid minute.
You will end up with a clean plank position and a weekly progression that takes a shaky 15 seconds to a solid minute.
The plank looks simple. You hold yourself up on your forearms and toes. It is harder than it looks, because your abdominals, obliques, lower back, shoulders, and even your glutes all have to engage to keep your body rigid and straight.
Form makes the difference between an exercise that builds your core and one that strains your lower back. The faults to watch for are sagging hips, piked hips, a dropped head, and held breath.
Set up your forearm position
Start by lying face down on the floor. Place your forearms on the ground with elbows directly beneath your shoulders. This alignment is critical. If your elbows are too far forward, the strain shifts to your shoulders. Too far back and your lower back takes over. Your forearms should be parallel to each other, pointing straight ahead. Hands can be flat on the ground or clasped together, whichever feels more natural. Fingers should be relaxed, not gripping the floor.
Position your feet and lift
Tuck your toes under and lift your body off the ground. Your weight should be distributed between your forearms and toes only. Feet should be hip-width apart. Closer together is harder because it reduces your base of support. Wider apart is easier and fine for beginners. As you get stronger, bring them closer together to increase difficulty. When you lift, push up through your forearms actively. You should feel like you are pushing the floor away from you, not just passively resting on your elbows.
Align your body into one straight line
Your body should form one rigid straight line from the crown of your head to your heels. The three alignment faults to watch for are sagging hips (lower back arches downward), piked hips (butt points toward the ceiling), and a dropped head. Sagging hips strain your lumbar spine and mean your core is not doing the work. Piked hips make the exercise easier but take the load off your core. A dropped head puts strain on your cervical spine. Look at a spot on the floor about 6 to 12 inches in front of your hands to keep your neck neutral.
Good to know: Imagine a broomstick placed along your spine. It should touch three points simultaneously: the back of your head, your upper back between the shoulder blades, and your tailbone. If any of these three points loses contact with the imaginary stick, adjust your position.
Engage your core actively
A plank only works if you actively contract your muscles. Passive hanging in position with gravity pulling you down does not build strength. It just stresses your joints. Tighten your abdominals like someone is about to poke you in the stomach. Squeeze your glutes firmly. That tilts your pelvis slightly backward (a posterior pelvic tilt), which keeps your lower back from arching. Pull your belly button toward your spine without holding your breath. You should feel muscle tension across your entire midsection, not pressure in your lower back or shoulders.
Breathe normally and hold
Straining with a held breath pushes your blood pressure up, and static holds like the plank raise it on their own, as the American Council on Exercise article in FAQ 4 notes. The National Institute on Aging tells you not to hold your breath during any strength exercise. If you have high blood pressure or heart disease, ask your doctor before adding planks. Breathe in through your nose and out through your mouth at a natural, relaxed pace. If you find yourself holding your breath, count your breaths. In for 4 counts, out for 4 counts. This gives your mind something to focus on and ensures continuous breathing. Hold the plank only as long as you can maintain perfect form and steady breathing.
Progress gradually and safely
If a full forearm plank is too difficult initially, start with a modified version on your knees instead of toes. Keep the same form for everything above the knees. Once you can hold a knee plank for 45 to 60 seconds with good form, graduate to a full plank. For full planks, start at your current maximum (even if that is 10 seconds) and add 5 seconds per week. Do 3 sets with 30 to 60 seconds rest between them. Train planks 3 to 4 days per week, never two days in a row. Your muscles need recovery between sessions to grow stronger. The Physical Activity Guidelines for Americans set the floor at muscle-strengthening activity on 2 or more days a week, working all major muscle groups.
When your hips start to sag or your lower back arches, the set is over. Extra seconds with bad form do not build strength. They just strain your spine. The 5 seconds a week from step 6 sounds slow, but it adds up to more than a minute in 3 months. Once 60 seconds with clean form is easy, move on to the harder variations in the FAQs below instead of holding longer, and if your lower back hurts during a set, stop and read the back-pain answer below. When you want to build upper-body strength next, our guide on how to do a pullup starts from zero.
Questions we get asked about this
Answers from experience, not a textbook.
The goal for general fitness is 30 to 60 seconds with perfect form. Past 60 seconds with clean form, longer holds add little. Progress to harder variations (weighted plank, single-leg plank, plank with arm reach) instead. Once form breaks down, extra seconds stop counting. Hold time on its own is a weak measure of core health anyway. A 2025 study of 117 adults in the Journal of Clinical Medicine found that people with low back pain held planks longer than people without it, and concluded that the balance between front and back endurance tracked function better than plank time by itself.
Plank 3 to 4 times a week. Your core muscles need recovery time to repair and strengthen, just like any other muscle group. The National Institute on Aging warns that overdoing strength exercises can cause exhaustion, sore joints, and muscle pain or injury. Mayo Clinic's rule for strength training is to avoid working the same muscles two days in a row, so leave at least one rest day between plank sessions. On rest days, train other muscle groups.
Lower back pain during planks usually points to sagging hips. Your core has fatigued and your pelvis is dropping, causing your lumbar spine to hyperextend. The fix is to stop the set immediately when you feel lower back strain. Drop to your knees, squeeze your glutes harder to maintain pelvic position, and reduce hold duration. Never push through lower back pain in a plank. It means your core has already failed and other structures are compensating.
As a default core exercise, yes. Planks train the core in its primary function, which is stabilization (keeping your spine safe during movement). The American Council on Exercise frames the difference as neutral spine loading versus trunk flexion. The sports physiologist ACE quotes warns that the trunk flexion of a sit-up can make a weakened spinal disc bulge or herniate. Done correctly, planks also activate the transverse abdominis, the deep stabilizer muscle under the six-pack. For general core strength with a neutral spine, planks are the better default. For visible abdominal definition, neither exercise burns off the fat over the muscles. In a 6-week trial in the Journal of Strength and Conditioning Research, seven abdominal exercises done 5 days a week did not reduce abdominal fat. Mayo Clinic agrees that burning stomach fat takes aerobic activity, while core exercises strengthen and tone the muscles underneath.
A properly executed plank works the rectus abdominis (six-pack muscle), transverse abdominis (deep core stabilizer), internal and external obliques (side muscles), erector spinae (lower back), anterior deltoids (front shoulder), quadriceps (front thigh for knee extension), and gluteus maximus (when actively squeezed). That is why it trains the whole core at once, in the same holding pattern it uses to protect your spine.
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How to Do a Plank
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