I have been playing around with an old and odd interest of mine:Static Apnea.
I went through a set of O2 tables and reached a surprising 4:30 in the end. As far as I can remember my previouis best was only 4:07 so I now have a new goal for the off season. Try to get 50% of the current world record of 11:35.
That makes my goal 5:47,5 but I think I’ll round it up to 6:00.