Fitness coach Jeff Cavaliere is sharing how to master one of the top leg exercises. In a July 27 YouTube video, he revealed the most common lunging mistakes to avoid and how to fix them. Jeff Cavaliere’s Crash Course for Proper LungingIn the video, Cavaliere explained that the two most popular lunging directions are forward and backward. “If you wanted to step forward, you have to at least continue in a walking direction. Cavaliere believes the forward lunge should be executed carefully due to the stress it places on the knees.