Jillian Michaels Reveals The Biggest Mistakes You Re Making When Doing Planks
Jillian Michaels Reveals The Biggest Mistakes You’re Making When Doing Planks Don Flood By Jorie Mark/Sept. 5, 2020 1:57 pm EST Sit-ups can be a struggle, with all of the hustling up and down from the floor to your knees — and it can be hard to know what to do with your arms. Do you cross them over your chest or tuck them behind your head, and for that matter, do you aim for your knees or is it good enough to just pulse upward?...