A theory and new technique
Not much is established on whether or not penis enlargement works by creating plastic deformation of the intracellular tissue or by inducing cellular growth and division, or some combination of both. If it is indeed cellular growth that is occurring, then I would expect there to be a factor of creating physical growth factors from these exercises that makes it work. My theory is that cyclic strain could be one of these growth factors. My reasoning is this. Jelqing apparently works by repeatedly stretching tissue to it’s maximum potential in a semi-erect state, but a full erection provides this force statically and penis growth does not occur from normal erections or masturbation. Masturbation does not create as much cyclic forces in the inner tissues of the penis, yet these tissues are still experiencing high pressure and force that comes with jelqing. Many articles discuss how cyclic strain induces stem cell differentiation and is a growth factor in the growth and maintenance of arteries and veins (hence maybe why veins are more prominent from penis enlargement). I know that clamping and hanging work by creating static forces, but these are done for excessive periods of time where as jelqing can be effective with much less time. Therefore, a hypothesis is that the cyclic nature of the exercises is critical to their growth.
If cyclic forces are more effective to inducing growth than static forces, could techniques be modified to take advantage of this fact? For example, how about a stretching exercise that works by having your penis at about 80% erect, then grabbing it below the head and quickly pumping it forward (stretching) and back down (compressing). This seems like a good exercise, but should be done briskly while not too hard. It can be called “stretch pumping” or something like that. I can’t vouch for it’s effectiveness because I only just thought of it and wanted to share these ideas anyway.