M.R.
If I am lifting, I like listening to Rush Chronicles.
When doing cardio, I (like a big ole nerd lol) like listening to Jock Jams circa early-mid 90s (Whoomp! There it Is, It Takes Two, Humpty Dance, anything Snoop and Dre, Republica - Ready to Go, Jellyhead).
I like a lot of the Britney Spears dance music, Black Eyed Peas/Fergie, etc.