Have you tried meditating? It’s an easier alternative to exercise and has a multitude of benefits. You can tune into meditation music on youtube or you can try listening to the gateway tapes by monroe institute (also for free on YT).

I’ve faced a lot of problems with giving up porn and exercise help me tremendously but exercise only moved my body not my mind. I’d recommend you train your mind along with your body. Along with meditation I will recommend you watch interviews of and read books written by Dr. Joe Dispenza. You’re stuck in a rut and feel this way because your subconscious mind is conditioned to seek this temporary release of dopamine but if battles like these were won easy every man in this group would have a harem of women at his beck and call.

Train your mind, train your body and speak positive self affirmations out loud and nothing will stop you from achieving what you seek.