VeryWellFit: "There are many benefits of planking as planks are an excellent abdominal and core exercise. To ensure you keep your core strong and stable, add the plank to your ab workout program."
[ID: plank]
Instructions
First time: Hold your plank position for 30 seconds
Steps:
Start position:
Lie on the stomach with your feet together and forearms on the ground with elbows under your shoulders
Your head is relaxed and you should be looking at the floor.
Engage your core and hold the plank position
Another popular option: In a push-up position, do the plank with your arms fully extended
Details
Progressions:
An easier plank variation: Keep your knees on the floor
To pass the US Marines Physical Fitness Test (PFT) you must plank for at least 1 minute, 10 seconds.
Plank for 3 minutes, 45 seconds and you'll get you a perfect score. Yow!
www.fitness.marines.mil/PFT-CFT_Standards17