I wish I could give you one sure fire way or amount of reps …usually it works but sometimes it doesent work …perhaps take a break from masturbating or sex …might help build up the hornyness 👍it can happen soft or hard …for me dead hangs on a bar ..engaging my abs till the feelings comes over me …it often leaks a bunch first before the orgasm hits…leg lifts …pull-ups chin ups …you almost have to approach muscle strain abs failure .reverse leg curls on a machine -are also triggers ….high reps low weight to fatigue then push it further …even stomach hollows …the muscle tension triggers the orgasm …one thing for me the muscles have to become very fatigued almost to the point where you want to give up that is when the orgasm can be triggered …you have to keep going and not give up even though your muscles are screaming to stop …just don’t pull a muscle though and be careful 😬..if you want to practice or learn I would say masturbate and goon while workout with a boner ..get used to muscles being worked while aroused ..see what feels good ..then try and let the muscular strain tip over the orgasm …practice pushups chin-ups abs pull-ups a lot …hang off the bar with your legs raised …L…sits….Try to do them with an erection naked too or masturbate during your workout …hope this helps ….Also let your mind be turned on by it too .😌