I'm a triathlete, so I'm pretty good in the drivetrain performance department.
I did shave my long (1") hair a few weeks ago and I'm due for another round of aeromodding as it's back to a shaggy 1/4". If I can grab it, it's too long. The long hair was just for insulating purposes in the winter and drove me nuts.
As far as weight reduction goes, I noticed 2 years ago what the desk job had done to me so I started working out and put on an additional 10 lbs by the time I got into tris. Now I'm back down to the weight I was when I thought I was out of shape, but another pant size smaller. 6' 175# and I couldn't go much lower without injuring myself.
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