MIS & PH definitely endurance. MM is like an abbreviated GS so I'd lean that towards strength but certainly still some endurance. I can't speak to CTX as I don't have it! I love the others, though. I really love MIS. I usually get good DOMS going on that one.
“In the beginning there was nothing. God said, 'Let there be light!' And there was light. There was still nothing, but you could see it a whole lot better.” --Ellen Degeneres