Answer:
I am an INFP, too, and I find that walking works very well for me. Also, tai-chi seems to to relax me and also fulfills my need for doing something that flows from one position to another and keeps me limber. I would say the best thing for INFP is to be able have other exercises to do when when we get bored with one type. I've done hand weights and bicycle riding as well. As far as type, whatever feels right for you personally is the best thing. One caveat: aerobics such as running and fast workouts. They wear me out and did, even in my 20s(I'm 53). Fast walking is our version of running---just change up your exercises once in awhile. Hope this helps. Love and Light