My boyfriend bought this game for me as an early Christmas present. I've just finished day 3 and I am SORE! RFA starts pretty slow, with the tutorial and set-up stuff. But once I got into world 3, it kicked my butt!
I love that you can play the adventure mode or just do the exercises you want in another mode. I also love that it monitors your heart rate and burned calories at the end of each level. It even takes into account the areas of your body you focused on throughout your workout and targets those areas when you're stretching.
The only thing I don't like-- and I realize this is nit-picky-- is Ring. That character does not. shut. up.
All in all, I'm very impressed with Ring Fit Adventure. It's very fun and satisfying to play.