SIDE BEND - HANDLES
Attach a resistance band to a door anchor and place the door anchor at the bottom of a door. Attach a handle to the other end of the resistance band. Stand side-on to the door. Bend down and grab the handle with arm nearest. Then stand whilst keeping arm straight.
Bend waist away from the door hold for 1 second and then return to original position whilst always keeping tension in the handle. Repeat with the opposite side.