MossRoad said:
I find illusionists entertaining. You can figure out how they do it, and you know how they do it, but the fun part is you can't see them do it.
Breath holders I hold in awe. I ain't gonna do anything in the water by myself... not worth the risk.
I had a rather serious amateur magician (paid good $ to buy tricks) as a room mate one summer session in college. He'd practice a trick on me and then I'd take his cards or other stuff and show him the trick. He hated that I could figure them out so fast and easy. (Chris Angel does stuff that I have no clue about how he does it. Some I figure easily but some is beyond my powers of observation and deduction.)
Most fun I had in breath hold was at a desert hot spring spa (Fountain of Youth) northeast of Salton Sea in SOCAL. A ham radio buddy (B-17 tail gunner in WWII) my wife, and I were in one of several large outdoor Jacuzzi pools. I explained to my buddy that the hot water makes less demands on your oxygen as you had less need to burn energy to make body heat.
I ended up demonstrating by putting my head at the bottom of the pool and my feet where my head had been. Unknown to me a Mexican employee of the spa was working his way along from Jacuzzi to Jacuzzi taking the water temp with a thermometer on a pole (worked from outside the fence where the controls were) and making any corrections needed.
My wife later related to me his consternation, surprise, and alarm as he approached our pool and noted my feet sticking out and the two of them chatting away from either side of my body. For all he knew they may have been holding me under. When he caught my friend's eye and looked questioningly at my feet and inverted body, he and my wife just smiled and gave a friendly wave like for sure nothing was wrong. They say he looked unconvinced but went along on his rounds, probably muttering about crazy baracho gringos.
A down side of breath hold is so many folks don't know how and it can be dangerous. The pros often pass out shortly after surfacing. One of the things that happens to the unknowing is that if you hyperventilate (taking several deep breaths and expelling them to charge your blood with oxygen) you scavenge a lot of the carbon dioxide out of your blood. The urge to breathe is principally caused by CO2 buildup not O2 depletion. By the time your O2 depletion alarm goes off you are passing out or near to it. If you do not overdo the hyperventilation the CO2 buildup will try to get you to breathe.
Your body's built in warning system works fine if you don't mess with it too much such as with hyperventilation. Even kids just playing in the pool trying to swim long distances underwater have passed out and drowned because they hyperventilated too much. You suppress the alarm system that makes you want to breathe and by the time your O2 sensor sounds the alarm it may be way too late to make it to the surface, even from just a few feet down in a pool.
The hard part is knowing how much hyperventilation helps but doesn't set you up for passing out underwater. One of my personal rules was to never take game using SCUBA. I did all my spear fishing doing breath hold. I guess a combination of luck and skill protected me.
Pat