The 4 Biggest Mistakes You're Making in Plank

Sometimes, you've just gotta relax, says Katie Kendall, trainer at Brick New York. "It's common for the upper body to tense up, leading to shrugged shoulders and an awkward neck position," Kendall says. "Try to keep your neck neutral with your spine and relax the shoulders away from the ears."

By fully extending your arms and spreading your shoulder blades, you can help maintain better balance and stabilization of the upper body throughout the movement.