One bar. No ego. Just strict form and a whole lot of pain. This Athlean-X pull-up challenge humbled me fast. I filmed every rep, and now I want to see what you’ve got. Post your score and let’s settle ...

"The abs flex the spine in two main ways—from the top-down with your rib cage being pulled toward your pelvis, and from the bottom-up with your pelvis being pulled up towards your rib cage," Cavaliere ...