or cardio with an audio you like: music, an audiobook, or a podcast. You can do it on a cardio machine. It is unusual that strenuous exercise makes you angry, but maybe it means you should go for Zone 2 training instead.

I knew a man who did not get endorphins from exercise. For him it was all boring. He also disliked showering after exercise (something that is purely hedonic for me, unlike showering without exercising first). But the man is a high-functioning autistic, so that might be to blame.

Have you tried cold showers? Say, just spray cold water on your feet and lower legs in the beginning?

Have you tried sauna/stream room treatments? For me, most endorphins come from temperature contrasts, such as submerging myself in a cold plunge after a sauna or stream room. Korean spas offer these.