[seanmcdirmid]

If your fitness experience doesn’t involve actual movement from one spot (like BeatSaber, fitXR, supernatural, on shape, etc…) you only need about 1m^2, probably a bit less (basically wherever your hands can extend to needs to be unobstructed).

[int_19h]

Beat saber does require movement to dodge blocks, though. And while 1m of sideways movement might technically be enough to dodge anything in the game (not sure tho...), in practice it can be hard to not move more than that once you start. I certainly wouldn't want to do that risking crashing into the surrounding furniture by moving further than necessary.