Plank: How to Train Your Core Properly

8 November 2026 5 min read

Hardly any exercise is as well known and at the same time as often performed incorrectly as the plank. You don't need any equipment, a large space or more than a few minutes. Even so, almost all the muscles of your trunk work together in the forearm plank: the rectus and oblique abdominals, the deep core muscles, the back extensors, the glutes and the shoulders.

That is exactly why the plank belongs in almost every good programme, from the beginner training plan to advanced strength training. A stable core helps you with squats, running, carrying shopping and long hours sitting at the office.

In this article we show you how the technique works, which mistakes to avoid, which variations add variety and how you can progress step by step.

What the Plank Does for Your Body

The plank is a so-called static exercise: you don't move, but hold a position against gravity. Your body has to prevent the pelvis from sagging or the hips from rising. This ability to resist movement is called anti-extension strength. It protects your spine in everyday life and when lifting heavy loads.

Unlike classic crunches, the plank puts little strain on the spine through flexion. This makes it more comfortable for many people, including those who want to strengthen their back in a targeted way. You can find more on the interplay of core and back on our page about a strong and healthy back.

Important to know: a plank alone won't make your belly fat disappear. There is no such thing as spot reduction. If that is your goal, read our article on losing belly fat. The plank does ensure that the muscles underneath become strong and stable.

Plank Technique: Step by Step

Clean execution matters more than a long hold time. Better 20 seconds done perfectly than a minute with sagging hips.

Get into the all-fours position and place your forearms flat on the floor, parallel to each other. Your elbows sit directly under your shoulders.
Extend your legs backwards and place your toes on the floor, hip-width apart.
Tighten your abdomen and glutes, as if you were gently drawing your navel towards your spine.
Press actively away from the floor so that your shoulder blades don't collapse.
Keep your head, back and heels in one line. Your gaze goes to the floor, just in front of your hands.
Keep breathing calmly and evenly. Bearing down only increases pressure unnecessarily.

The last point is often underestimated. Our article on breathing during strength training explains how to control your breath under tension.

The Most Common Mistakes

Hollow back: The pelvis drops and the lower back takes over the work. Tighten your glutes more consciously.
Hips too high: The body forms an inverted V. This looks easier but takes the abs out of the exercise.
Hanging shoulders: The upper body sinks between the shoulder blades. Press actively away from the floor.
Head in the neck: Looking forward overextends the cervical spine. Keep your neck long.
Holding your breath: Keep breathing in small, calm sips.

Plank Variations for More Variety

Once the basic position feels secure, you can use variations to create new stimuli. This keeps training interesting and challenges different muscle groups a little more each time.

Easier Variations

Knee plank: The knees stay on the floor and the body forms a line from head to knees. Ideal for getting started.
Elevated plank: Forearms or hands on a bench or chair. The higher the support, the easier it gets.

More Demanding Variations

Side plank: On one forearm, supported on the side of the body. Works mainly the obliques and the side of the hip.
Plank with leg lift: Alternately lift one leg a few centimetres without the pelvis tilting.
Plank shoulder taps: In a high plank on your hands, alternately tap the opposite shoulder with one hand. The pelvis stays still.
Plank walk-ups: Move from the forearm plank into a high plank and back. Additionally strengthens arms and shoulders.

These variations fit well into a full-body workout, for example as a finisher after the main basic exercises.

Your 4-Week Plan for the Plank

Plan three sessions per week with at least one rest day in between. The times are guidelines. Listen to your body and stop as soon as your technique starts to slip.

Week 1: 3 sets of forearm plank for 15 to 20 seconds each, with 45 seconds rest. Use the knee plank if needed.
Week 2: 3 sets of 25 to 30 seconds plus 2 sets of side plank for 15 seconds per side.
Week 3: 3 sets of 35 to 45 seconds plus 2 sets of plank with leg lift (6 per side).
Week 4: 3 sets of 45 to 60 seconds plus 2 sets of shoulder taps (8 per side) and 2 sets of side plank for 25 seconds.

You don't need to hold for longer than about a minute. If you want more challenge, switch to a harder variation instead. If you enjoy core work in a group, our Core Training class is a good addition.

Frequently Asked Questions

How long should you hold a plank?

For most goals, 20 to 60 seconds per set in clean technique is enough. What matters is that your pelvis and shoulders stay stable. Record times bring little extra benefit for everyday life.

Can I do the plank every day?

Short plank sessions place little strain on the body, but the core muscles still need recovery. Three to four sessions per week is a good rhythm. If you have back problems, get advice from a doctor or another qualified professional first.

Does the plank replace abdominal training?

The plank is a very good foundation but doesn't cover everything. Supplement it with exercises for rotation, back extensors and glutes, and you will train your core all round.

Conclusion: Small Exercise, Big Effect

The plank is quick to explain but only truly effective with clean technique. Focus on a straight line, active shoulders and calm breathing, progress through variations rather than endless hold times, and combine it with balanced strength training.

Would you like a coach to check your posture and show you how the plank fits into your training plan? Book your free trial session at update Fitness and start a personalised plan for your core training.