The psoas major muscle (pronounced "so-as") is often referred to as the deepest core, or as yoga therapist and film-maker Danielle Olson states, the "muscle of the soul." This core-stabilizing muscle located near the hip bone affects mobility,.
Quite a simple diagram focusing on posterior muscles - great when I need to be working on isolated muscles when I train for Competition time. But as a PT, these muscles names are already in my vocab - so I just admire the colour
8 Things You Should Never Do On Back Day. In regards to number don't become reliant on lifting straps. I see so many guys at the gym overusing them & then they wonder why their forearms & hand strength/development are lagging.