What is the best position ? Sited with knees above waist? What should be the percentage of the erection while working the BC, Flaccid or full erect?
Exercising the BC muscle involves doing Kegel’s exercise. Simply contracting and relaxing the muscle. No special position is needed and it can be done flaccid or erect, but most do it flaccid. Many guys exercise it while driving or at other times when they remember to do it.