Simple way of intensifying the stretch
Hold your Penis below the glans by a firm grip and stretch it out completely. Make sure the penis is almost touching your belly button(straight up stretching). while stretched, do a strong kegel and you will have feel that your dick is being pulled back. Kind of a reverse stretch. Do it atleast 10x3 times. This way you will also ensure a good kegel workout along with reverse stretching. I find that it gives me a good work out since there is some force working in both directions. Let me know how you guys find it.
Walk slowly but never backwards.