i heard good things about the ring fit, they say it's about 80hrs of gameplay which is quite impressive for an exercise game...
i see no reason why you can't fool the sensors, strap it to your arm or something, it's not camera based or something like that, just detecting movement - same principle that made the wii remote a bit rubbish when you can be just as good by flicking your wrist as you are doing the full motions
unfortunately exercise isn't really supposed to be fun... the main reason i avoid it
i wonder if the switch will get a (non-vr) version of beat saber though, that might be good exercise... beat saber is crazy in VR - easily the most intense exercise you get in VR and i've played VR boxing etc so it's quite an impressive feat - especially considering it is 99% just moving your arms (of course i mean expert or expert+, normal is like a stroll in the park
)