For almost three months now I've been swimming for two hours a day, five times a week.
Has it made me healthier? Probably. Happier? Possibly. Saner? Probably not. These are all so hard to quantify, but there is one very noticable change that has occured due to this new habit of mine, and I can now tell you wholeheartedly and even provide visual proof that swimming turns you into a blonde!
I direct your attention to exhibit A, a photo of myself about four months ago, examining some delicious looking cows:

Black and Proud
Now feast your eyes on exhibit B, a very recent photo of myself striking a somewhat Flavian pose:

Brown round my crown
Yes, ladies and gentlemen, this is real! No trick of the light here, in fact here's an extreme close up (Exhibit C):

Amber waves of hair
I believe it's only a matter of time before I become legally Blonde. I just hope I don't go through a ginger phase (shudder).