Exercise Demo: Mountain Climber Posted January 31st, 2013 by Nicole . 2 Comments Joan Gorzell says: June 10, 2019 at 11:38 pm Is there any alternative for this one? Log in to reply Courtney says: March 1, 2021 at 11:10 pm What does this mean if it KILLS your lower back?! 😱 Log in to reply Leave a Reply Click here to cancel reply. You must be logged in to post a comment.