I'm looking for something that builds nicely over about 2 hours. I play a lot of "Spider-man: Into the Spiderverse" right now. Or Big Gigantic.
edit: I also like to have something visually interesting to look at, since I'm just working out in my room. Lots of "visuals" on youtube. Was doing old Godzilla movies for awhile, or random Anime.
I switch it up every once in a while. Usually go between british metal, rap, or movie soundtracks (specifically the rocky movies).