Butt is slid a bit further back on the saddle in order to further cultivate the use of glute and hamstring muscles. Lower abs are tucked in so as to push the butt down and back into the saddle. Arms, back, and shoulders are utilized to pull on the handlebars to assist the lower body in keeping the pedals constantly rotating in a smooth, regular cadence. If riders are getting out of saddle to apply body weight to the pedals during a long seated climb, then they are using too much resistance and probably have a rounded back, relaxed abs, and a bogged down cadence. They should be encouraged to stay with the seated position and keep their momentum up by using somewhat less resistance.
Weight is entirely on the saddle and feet, with no weight whatsoever on the handlebars.
As resistance increases, the handlebars can be pulled against in order to create leverage for the lower body and to aid in timing and rhythm. Spine is exceptionally straight, pelvis rotated forward, elbows bent moderately, with the upper body parallel to the earth. Shoulders and neck are relaxed entirely, with the shoulder blades dropped comfortably toward the earth. Importantly, the lower abs are tucked in to support the lower back. Arms, back, and shoulders are utilized to pull on the handlebars to assist the lower body in keeping the pedals constantly rotating in a smooth, regular cadence.