The in room set up comes via a list from your cabin steward. They didn’t have much that appealed to me so I opted for wine, what I asked for didn’t appear and was a random bottle instead. Champagne was not an option although I know someone who asked for managed to get one on the lowdown! I’d say don’t count on it. If you do a back to back you only get the set up once (veuve etc).
They definitely had a few solo events, and they’ll pounce on you during boarding if you’re solo. I didn’t go so can’t comment on quality.
In terms of free exercise, there’s yoga at the start/end of each day which was excellent. There are also some short HIIT classes during the day using the technogym equipment. The studio is pretty small so if you’re keen make sure to get there a bit early. Enjoy!