Meet Alexia Kraft de la Saulx, the woman who ditched upright walking to channel her inner wolfhound. Quadrobics—crawling like a critter—has her swinging from trees and racking up Instagram followers faster than you can say “fetch!” Sure, her feet are tougher than a rawhide bone, but her core’s so strong she could probably bench-press a bulldog. This isn’t your childhood stair-scramble; it’s fitness gone full Tarzan!

Woman who ‘walks on all fours like a dog’ reveals major impact it has on her body