Further to my previous post…
The comments are as educational as the video. Here are some:
1. The purpose of the plank is for strengthening the inner spine muscles. To use them for building is ridiculous. To use them to strengthen inner muscles for the purpose of back recover is priceless.
2.Remember that this is body building advice. Planks are good for general core stability and back pain.
3. As a career trainer and rehab specialist (23 years) I train general population. There are many factors that go into program design. I wish all my clients could safely execute the most concentric/eccentric full range of motion exercises. Alas, their injury, mobility, rom, and other limitations require “less optimal” exercises.