All sort of moving revives the circulation, also in the genitals. In sitting jobs standing 10–30 % of the office working time, in 15–20 min is ok. Cartilages in joints degenerate in long-term standing. More motion one can get with the chair in “sit and swing” and “roll and reach” motions. Phone calls should be done walking as often as possible.
Always swim nude when possible. There are always stairs to take or places to walk to, things to carry, yards to clean up, and housework to do manually. Learn to recognize and utilize every little possibility for exercise or move. When doing yard work, do the chores manually with good tools. When doing it, breathe rhythmically as in exercising.
It is very useful for men to train their pelvic floor muscles and simultaneously the muscle that is around the “root of the penis” = the lowest part of the penis. The pudendal nerve that controls the pelvic floor also controls the penis. This means that conscious and strong muscle contraction in the pelvic floor also contracts the muscles in the penis. This tension (5–7 seconds at the time, 10–20 times in each training session) will enforce the muscles, increase circulation, and improve nerve functions like muscle exercises normally do. This is beneficial to the operation and health of the rectum and enforces the capacity for better and stronger erection. During erection men also produce more testosterone. A man gets combined and even stronger benefits (testosterone, stronger pelvic floor muscles, and better circulation/erection) when doing pelvic floor exercises during erection.
Bicycling (or dressage riding or sitting on undivided saddle chairs) is highly NOT recommended for men if the saddle is putting ANY pressure on the “root of the penis” as they usually are. Unfortunately, bicycle saddles always cause pressure on the penis. If one has any problems with erection, it’s smart not to bicycle. It is helpful to adjust the saddle “nose” sloping slightly down to eliminate the pressure on the root of the penis.