>>82246107
>>82246088
>>82246100
Stretching skin isn't the same as stretching a penis, the sponge structure inside of dicks is incredibly complex and simply making it stretched out isn't what those exercises are doing.
The penis has hundreds, thousands of tiny valved "pockets" which fill with blood, and each one can only hold so much of it. The amount of blood they hold determines how big they inflate to, which in aggregate determines how big your penis becomes when erect.
The exercises (and devices) force more blood into those pockets than they can normally handle - if this is done too forcefully they'll rupture (obviously terrible and damaging), but there's a range beneath that point at which they'll be forced to individually overinflate just slightly. That is still stretching, true, but it's a "complete" stretch in all directions; it's not just a pull.
Once these pockets have this overinflation happen enough times they gradually adapt like every other part of your body and expect that excess blood as the norm. Once that happens, your dick becomes (marginally) larger, and you repeat the process for hours a day and months if not years in total for actually noticeable permanent gains. At that point, because the pockets are used to that increased blood flow, you no longer need the devices or exercises to get the extra blood in there, because your dick isn't resisting that quantity as it used to.