I'd bet that frequent yachting is also healthy.
You can buy prefab kits (so the moisture barrier is built in and the benches are pre-assembled) from companies like Finnleo, or you can buy a stove alone from tons of places. Just make sure you're buying a stove that is truly meant for a sauna (throwing water/making steam) instead of a heater for an infrared room (different!).
He just asked that you don't be "shallow", or in your own words, "snarky" about it, as it always makes discussions worse and degrades HN overall.
It's concentrated uncomfortable sitting around combined with the occasional panic. If you're buoy racing, it's on the rail, over the top and grind for 3-5 seconds and on the rail.