I don't. Revision isn't fun and I don't try to kid myself that it is. I just try to get it over with as soon as possible so I can get on with genuinely fun things!
Listen to music usually, sometimes I reward myself with food if I've learnt something ridiculously boring and I highlight my books because the dark colour scheme is really depressing
I read the textbook out loud in a weird voice and I exaggerate expressions on my face while taking notes. I just pretend learning is fun and it works out for me