Abs Core Toning using a BOSU Sep 10, 2014 Exercise your core and abs doing this segment on the floor or on the BOSU for effective toning. [videojs mp4=”https://www.personal-fitness-trainer-austin.com/videos/Elbow.Knee.Abs.mp4″ ogg=”https://www.personal-fitness-trainer-austin.com/videos/Elbow.Knee.Abs.ogv” poster=”https://www.personal-fitness-trainer-austin.com/videos/Elbow.Knee.Abs.jpg” width=”350″] Take care, Margo