I bought it with reservations since I read quite good reviews, but I didn't have an opinion on such games.
Very well made, you sweat and you don't realize that you're exercising.
The progress of the game is very well designed so that even someone who is not fit can follow it and of course reap the benefits.
We often play it with friends using 2 sets of joy-cons since it supports multiplayer and we have a great time, with lots of laughter and adding some extra movement to the fun.
The routines that the game teaches are quite good.
If you want something for movement that others can play at the same time, I recommend it, otherwise for solo play, go for ring fit adventure.