The plank is a core stability hold performed on your forearms and toes or knees. Keep your body in a straight line and your trunk steady. Start with a knee plank and progress to a front plank as you get stronger.
| Quick Guide | Starting Point |
|---|---|
| Main movement | Static core hold |
| Main target muscles | Abdominals, obliques, deep trunk stabilizers |
| Beginner prescription | 2 holds of 15–30 seconds |
| Rest | About 60 seconds between holds |
| Frequency | Start with 1–3 core-focused sessions per week |
| Most useful cue | Keep your body in a straight line from head to heels or knees |
These are starting suggestions, not a prescription tested for every reader. If you have back, shoulder, or wrist pain, get individualized advice before starting.
How to Do a Plank
Knee Plank (Recommended to Start)
- Rest on your forearms and knees with your elbows under your shoulders.
- Lift your hips so your body forms a straight line from head to knees.
- Squeeze your abs, glutes, and thighs.
- Hold without letting your hips sag or rise too high.
- Breathe normally and stop when your form breaks down.
Front Plank
Rest on your forearms and toes with your body in a straight line from head to heels. Hold the same position as the knee plank, but with more load on your core.
Which Muscles Does a Plank Work?
A plank primarily trains your abdominals and obliques. Your shoulders, glutes, and thighs assist with holding the position.
What Are the Benefits of Planks?
- Train core stability without requiring movement or equipment.
- Teach your trunk to stay still under load.
- Can be progressed easily through time, variations, or added limb movement.
Front Plank vs Knee Plank vs Plank Shoulder Taps
| Variation | How to Do It | Best For |
|---|---|---|
| Knee plank | Hold on forearms and knees with body in a straight line. | Beginners learning core stability. |
| Front plank | Hold on forearms and toes with body in a straight line. | Progressing core endurance after knee planks. |
| Plank shoulder taps | From a front plank, lift one hand to tap the opposite shoulder, then switch. | Adding anti-rotation challenge to the plank. |
Which Mistakes Should You Fix First?
| What You Notice | What to Try |
|---|---|
| Your hips sag toward the floor | Shorten the hold and squeeze your glutes and thighs |
| Your hips pike upward | Lower your hips until your body is straighter |
| You hold your breath | Breathe normally through your nose and mouth |
| Your shoulders shrug | Press your forearms into the floor and keep your shoulders down |
How Many Sets and How Long?
Start with 2 holds of 15–30 seconds. Rest about 60 seconds between holds. Add time in five-second increments only when you can hold the position with a steady back and comfortable breathing.
Frequently Asked Questions
What muscles does a plank work?
A plank primarily trains your abdominals, obliques, and deep trunk stabilizers. Your shoulders, glutes, and thighs assist with holding the position.
How long should a beginner hold a plank?
Start with 15–30 seconds for a knee plank or wall plank. Add time in five-second increments only when you can hold the position with a steady back and comfortable breathing.
What is the difference between a front plank and a knee plank?
A front plank is performed on your toes and forearms. A knee plank is performed on your knees and forearms, reducing the load on your core and making it easier for beginners.
Can I do planks every day?
Start with one to three core-focused sessions per week. Your core also works during many other exercises, so daily planks are not necessary.
What are plank shoulder taps?
Plank shoulder taps are a plank variation where you lift one hand to tap the opposite shoulder while keeping your hips steady. They add an anti-rotation challenge to the plank.
What if my lower back hurts during planks?
Try a knee plank or wall plank instead. Keep your hips from sagging and stop if back pain persists. Get individualized advice for recurring discomfort.
How do I progress planks without equipment?
Add time, move to a toe plank, add shoulder taps, or lift one leg briefly while holding the position.
References
- American College of Sports Medicine. 2026 resistance-training guidelines announcement. March 17, 2026. Official summary.
- NHS. How to improve your strength and flexibility. Reviewed July 21, 2026. Guidance.