I was talking to a Physical Therapist and he said it is always best to be breathing out if doing something strenuous. He said for a golf swing, when at address, take one deep breath in/out, take a 2nd deep breath in and start the swing as you breath out.
Opinions?
I remember reading that a few years back. LDer's call that grunting at impact....LOL
I competed in power lifting for a number of years and obviously this approach was used. It became second nature now with most activities requiring exertion and i have done it unconsciously in golf
Agree. Widely coached for most activities that require short bursts. Exhale on trigger pull!
Bravopilot holds his breath during his swing.
Nothing new for me! Hoping like heck it doesn't carom off a skull somewhere down the line.....offline that is. 
This is actually an interesting thing, I never really thought about. If you learn to shoot properly, you are taught to take a deep breath, breath half out hold and pull the trigger. That creates stability in your core and relaxes your shoulders so you don’t jerk the trigger or move your sites. I could see the same idea working well in golf. Breath it out, get yourself as free of tension as possible in the muscles that pull the club off line and stabilize your core so you are less likely to collapse as you go down through. Time to test this out!
Isn't this what ask your opponent to try to screw up his swing during a match? 
An old mind game. Love it.
I have never thought about my breathing while swinging a club. I probably hold my breath as I tend to actually curl my lips in and bite down. That I do try to not do at times when I notice teeth marks inside my gums!
Yes I breathe. Would die if I stopped
I hold my breath because I never know where the ball is going.
