ProgreviaPlank: proper form, muscles worked and common mistakes
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How to do it
Forearms under the shoulders and body in a straight line from heels to head. Brace glutes and abs without letting the hips drop or pike up; keep breathing and hold for the target time.
Muscles worked
Main muscle: abs. When it plans weekly volume, every set of this exercise counts in full for abs: the generator does not split it with other muscles.
Plank versus side plank: what each one demands and which to use as your benchmark
The front plank and the side plank do not train the same thing even though both are called planks. The front one is anti-extension: it keeps the hips from sagging and the lower back from sinking, and it shares the work among the rectus abdominis, transverse abdominis, glutes and shoulders, which carry part of the weight. The side version resists collapsing toward one flank and loads the obliques and quadratus lumborum. The front plank is also easier to measure and scale, which is why it is usually the first isometric people learn and the one used as a benchmark.
Start here if you are new to core work or want an exercise that needs no equipment and can be repeated anywhere. Pair it with the Side plank, the Dead bug or the Hollow hold to cover the front and the sides. If you feel tension in your lower back, it usually means the hips have sagged: end the set sooner or rest on your knees. Your shoulders should push the floor away, not hang from it.
Holding longer and longer is not the best way to progress. Once you reach a comfortable time with good form, change the lever: move the forearms forward, bring the feet closer, lift one foot off the floor, or add weight on your back with a partner's help. Less time at a higher difficulty also saves minutes in your session.
Technical sheet
- Movement pattern
- Core
- Minimum level
- Beginner
- Technical demand
- Basic
- Fatigue it generates
- Low (0.4 out of 2.2)
- Risk if technique breaks down
- Low
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As an isometric exercise, it is programmed by time: 3–4 sets of 20–45 seconds holding tension without losing position. Increase time under tension before adding difficulty.
Common mistakes to avoid
- Letting your hips sag or piking them up: keep a straight line from shoulders to heels.
- Sticking with the same version once you can hold it for more than a minute: move to a harder variation.
- Holding longer than you can keep your position: the moment your form breaks, the set is over.
What the research says
This is an isolation exercise. For beginners, adding it on top of compound lifts does not always help: in the trial by Gentil and colleagues (2013), people who only did lat pulldowns gained as much arm size as those who also did curls. It earns its place with experience, and for muscles the big lifts leave short.
On how hard to push: the meta-analysis by Refalo and colleagues (2023) found no clear advantage in going to failure over stopping just short of it. That is why the generator programs it with reps in reserve (RIR) instead of asking for failure on every set.
- Gentil P, Soares SR, Pereira MC, et al. Effect of adding single-joint exercises to a multi-joint exercise resistance-training program on strength and hypertrophy in untrained subjects. Applied Physiology, Nutrition, and Metabolism. 2013;38(3):341-344.
- Refalo MC, Helms ER, Trexler ET, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine. 2023;53(3):649-665.
How Plank compares with other abs exercises
Of the 14 abs exercises in the catalogue, ranked from least to most fatiguing by the values the generator uses, Plank is number 3 (tied with 4 others).
That makes it a good candidate for adding abs sets at the end of a session or in heavy weeks, when you want volume without extra fatigue.
With different equipment, the same movement pattern offers 3 alternatives, such as Cable crunch, Pallof press and Landmine rotation.
| Exercise | Equipment | Fatigue | Technique |
|---|---|---|---|
| Dead bug | bodyweight | Low (0.3 out of 2.2) | Basic |
| Bicycle crunch | bodyweight | Low (0.4 out of 2.2) | Basic |
| Cable crunch | cable | Low (0.4 out of 2.2) | Basic |
| Pallof press | cable | Low (0.4 out of 2.2) | Needs coaching |
| Plank | bodyweight | Low (0.4 out of 2.2) | Basic |
| Side plank | bodyweight | Low (0.4 out of 2.2) | Basic |
| Hollow hold | bodyweight | Low (0.5 out of 2.2) | Needs coaching |
| Lateral plank walk | bodyweight | Low (0.5 out of 2.2) | Needs coaching |
Bodyweight. In the trial by Kotarsky et al. (2018), four weeks of progressively harder push-ups significantly improved bench press 1RM, just like training the bench press itself. It is a strength result, not a hypertrophy one, and the condition is the word progressive: the exercise has to keep getting harder.
An isolation exercise. In the trial by Gentil et al. (2015), with untrained young men over ten weeks, the biceps curl and the lat pulldown were equally effective for gaining strength and size in the elbow flexors: isolation is not filler.
- Kotarsky CJ, Christensen BK, Miller JS, Hackney KJ. Effect of progressive calisthenic push-up training on muscle strength and thickness. Journal of Strength and Conditioning Research. 2018;32(3):651-659.
- Gentil P, Soares S, Bottaro M. Single vs. multi-joint resistance exercises: effects on muscle strength and hypertrophy. Asian Journal of Sports Medicine. 2015;6(2):e24057.
Related guide
How Long to Hold a Plank: Technique and Variations
Alternative exercises
More core exercises
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Frequently asked questions
What muscles does Plank work?
Plank mainly works the abs muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of Plank should I do?
Between 3 and 4 sets of 20–45 seconds per session. With isometrics you progress by extending time under tension or adding difficulty (weight, less stable support), not by counting reps.
How long should I hold a plank?
As long as you can keep a straight line without the hips dropping or rising. When that form breaks, the set is over even if the clock says little. If you can hold for ages with ease, stop stretching the time and make it harder with a longer lever or added load. A few quality sets beat one long, sloppy attempt.
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