The StrongFirst plank develops the essential for strength skill of “tightness.”
Here is a stronger way to plank. Compared to the traditional plank, in the SF plank the internal obliques fire twice as strong, the abs three times as strong, and the external obliques four times as strong. (Contreras)
Assume the plank position with your forearms a shoulders width apart and parallel to each other. Form fists and semi-supinate the wrists (the hammer position). Your spine and legs should form a straight line; nothing may protrude or sag. Tense your whole body, except for the face, neck, and traps, look straight down between your fists and breathe shallow with your diaphragm. Lengthen your neck and tuck your chin in slightly.
Note the differences when planking to improve one’s iron game as opposed to bodyweight strength. For the former, maintain a neutral lumbar spine, a neutral pelvis, and do not protract your shoulder blades. This “cylindrical” posture is demanded by deadlifts, swings, and many other barbell and kettlebell exercises.
When planking for bodyweight strength, the goal is to assume the hollow position: a slight posterior pelvic tilt, a straight lumbar spine (no curve), and protracted scapulae.
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StrongFirst Certified Kettlebell Instructor Manual, 36th Edition
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