How to do a plank without hurting your back
To plank without straining your back, begin on your knees with forearms flat and elbows under your shoulders, and make a straight line from head to knees before you ever lift onto your toes. Tuck your tailbone slightly, keep your gaze on your hands and breathe normally. End each hold the moment your hips drop or your back complains, and build with short, repeated holds.
Why it matters: A plank teaches the whole trunk to stay firm, and a short solid one beats a long sagging one.
Steps
- Kneel on a mat and place your forearms flat, elbows under your shoulders.
- Walk your knees back until your body forms a straight line from head to knees.
- Tuck your tailbone slightly and draw your ribs down toward your hips.
- Look at your hands so your neck stays in line with your back.
- Breathe normally; if you cannot talk in short phrases, the hold is too hard.
- End the hold the moment your hips sag or your back aches, then rest and repeat.
- Lift onto your toes only when the knee version feels solid for every second of the hold.
Stop and call a professional if
- your lower back aches during every hold, even on your knees: stop and see your clinician or a physical therapist
- you notice doming along the middle of your stomach or pelvic pressure while holding: see your clinician or a pelvic floor physical therapist
- you are pregnant, gave birth in the last year, or have a heart, joint, bone or pelvic floor condition: ask your clinician or a physical therapist which movements suit you first
- you feel chest pain or pressure, faintness or breathlessness far beyond the effort: stop and call your local emergency number, 911 in the US
Common mistakes
- Starting on the toes before the shape holds on the knees.
- Pushing the hips up into a tent to make it feel easier.
- Staring ahead so the neck cranks back.
- Timing a hold instead of watching the shape.
Teach this to someone
A one page sheet for showing a friend, a teenager or a parent: what to say, what to show, and one question to check it landed.
Teach: How to do a plank without hurting your back
What to say
To plank without straining your back, begin on your knees with forearms flat and elbows under your shoulders, and make a straight line from head to knees before you ever lift onto your toes. Tuck your tailbone slightly, keep your gaze on your hands and breathe normally. End each hold the moment your hips drop or your back complains, and build with short, repeated holds.
What to show
- Kneel on a mat and place your forearms flat, elbows under your shoulders.
- Walk your knees back until your body forms a straight line from head to knees.
- Tuck your tailbone slightly and draw your ribs down toward your hips.
- Look at your hands so your neck stays in line with your back.
- Breathe normally; if you cannot talk in short phrases, the hold is too hard.
- End the hold the moment your hips sag or your back aches, then rest and repeat.
- Lift onto your toes only when the knee version feels solid for every second of the hold.
Where it stops
Stop and call a professional if your lower back aches during every hold, even on your knees: stop and see your clinician or a physical therapist.
Check question
Where should a beginner start a plank?
Answer: On the knees, with a straight line from head to knees. The knee version teaches the shape with less load on the back.
Your checklist
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Quick quiz
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Related skills
Sources
- Certified exercise professional guidance on movement form, 2025. Reviewed September 28, 2026.
Written in our own words from the sources above. It is general information, not advice for your situation; where a professional, your doctor or your lease says something different, follow them.
Last reviewed . First published .