I am joining @audreytectorfanning in this November plank challenge anyone else want to join us. #plankchallen… | Plank challenge, Abs workout, Effective ab workouts
30 Day Plank Challenge for Tight, Toned, Flat Abs and Core Strength
Join the 30-Day Plank Challenge! | Fit Marriage
Holmes Junior High School - Fantastic 30 Day "Plank Challenge"