I discovered this unique abdominal exercise about a decade ago in the e-book The Bodybuilding Truth by Nelson Montana. According to Montana, abdominal development is genetically determined, and classic movements like sit-ups and leg raises are largely ineffective for the abs—those movements hit the psoas (hip flexors) more than anything. Montana believes the abdominals respond…
I first came across this exercise in the book Underground Secrets to Faster Running by Barry Ross. No matter how strong you think your core is, Ab 45s will humble you! Here’s how you do it: Lie on your back with your knees bent and hook your feet under something stable that won’t move—like a…