May 28, 2025, 10:55 am | Read time: 5 minutes
Core stability is the foundation for almost every movement in daily life and sports–it not only makes you strong but also stable, secure, and in control of your movements. Classic abdominal exercises like sit-ups barely reach the deep muscles in the core. However, these five isometric plank variations in the video do.
In this article, you’ll learn about five effective isometric plank variations, along with tips on proper technique. Discover which muscle groups are particularly engaged and how long you should ideally hold each position.
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Overview
Dynamic vs. Isometric Planks
Planks are among the most effective exercises for core stability and overall posture. They not only strengthen the abdominal muscles but also activate the back, shoulders, glutes, and legs. In addition to dynamic plank variations, where arms or legs are moved, such as in “Mountain Climbers” or “Plank Rows,” which combine strength with coordination, there are the (classic) variants: isometric exercises, where the muscles are tensed without visible movement. The position is held statically, primarily training the deep stabilizing muscles. This video focuses on such plank variations.
The 5 Isometric Plank Variations in This Video
Forearm Plank
A classic plank variation where you support yourself on your forearms instead of your hands. Ensure that your shoulders, hips, and ankles are in line. Pull in your stomach. The back should not sag, and the buttocks should not rise too high. The head should also be held in a neutral, straight position as an extension of the spine to avoid neck strain. It’s best to practice the first planks in front of a mirror and correct yourself.
High Plank
The high plank is the starting position for push-ups. Support yourself on your hands, which should be directly under your shoulders. Shoulders, hips, and ankles should form a line. Pull in your stomach. If your back sags, actively pull in your pelvis. The buttocks should not rise too high. The head should also be held in a neutral, straight position as an extension of the spine to avoid neck strain. It’s best to practice the first planks in front of a mirror and correct yourself.
Cross Body Plank
A high plank variation for the oblique abdominal muscles. One knee is drawn under the body to the opposite elbow and held.
Also interesting: 4 variations of the side plank that make the workout even more effective
Leg Raise Plank
Starting from the high plank, lift one leg slightly while keeping it straight. A stable hip is particularly important, with no swaying. This variation additionally activates the gluteal muscles and lower back.
Arm Reach Plank
Starting from the high plank, lift one arm in front of the body or extend it to the side. This variation significantly increases the balance and core challenge.
The variations Cross Body Plank, Leg Raise Plank, and Arm Reach Plank are noticeably more challenging than the classic forearm plank–but you will feel the effect.
How Long Should You Hold Isometric Plank Positions?
The goal is to hold the planking position for as long as possible. You’ll quickly notice that the exercise is much more strenuous than it looks. Initially, try planking for 30 seconds. Then gradually increase to one minute and so on. Up to two minutes per session should be sufficient to effectively strengthen the core. Advanced practitioners can further increase the challenge with additional loads (e.g., weight on the back or an unstable surface) to introduce new training stimuli.
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Repetitions and Breathing Technique
Four to five sets per session are recommended.
Pay attention to calm, even breathing. Do not hold your breath–this unnecessarily increases pressure in the abdominal cavity and reduces the training effect.
Also interesting: Is it beneficial to plank for a long time?
The current Guinness World Record for the longest time in a forearm plank is held by Josef Šálek from the Czech Republic. On May 20, 2023, at the age of 53, he held the plank position for an impressive 9 hours, 38 minutes, and 47 seconds (FITBOOK reported). For women, Donna-Jean Wilde from Canada holds the world record. In March 2024, at the age of 59, she completed a plank for 4 hours, 30 minutes, and 11 seconds (FITBOOK reported).
Muscles Trained by Isometric Plank Variations
All variations also promote the deep muscles, particularly the transversus abdominis, which acts like an “inner corset muscle” and is crucial for stability, posture, and back health.
- The forearm plank primarily trains the abdominal muscles and the transverse abdominal muscle. Additionally, shoulders, back, and glutes are engaged.
- The high plank engages the core, chest muscles, and shoulders. Triceps, quadriceps, and back are also engaged.
- The cross body plank particularly trains the oblique abdominal muscles. Additionally, shoulders, hip flexors, and leg muscles are engaged.
- In the leg raise plank, the gluteal muscles are primarily engaged; the back, hamstrings, and shoulders are also involved.
- The arm reach plank particularly challenges the core muscles, shoulders, and back. Additionally, the chest, glutes, and deep stabilizing muscles are trained.