Practically, it means doing a bike and run back to back to prepare your legs for the state which they will endure during the actual race.
But when it comes to understanding the acronym, and what it stands for, I am at a total loss. My best guesses are as follows:
See the problem I am having here? So when I attempted to preform this feat on Saturday, bike 11-12 miles then run 3 miles, I felt saddened by my stupidity. No, not by the throbbing pain in my knee, the numbness in my hands, or the soreness of my legs, my ignorance made me sad. So this morning, I resolved to be ignorant no longer and so I googled the term.
And the good news is it doens't really stand for anything according to some guy on the interwebs who is in Minnesota racing and writing about triathlons. He seems to know what he is talking about and according to the guy, Brick means:
Some think its origin come from “B”ike and “R”un. Others say the term “brick” only accurately reflects what your legs feel like when you jump off the bike and start running. Still others say the term comes from New Zealand triathlete Mike Brick who perhaps coined the term when he started doing the regimen.
Ok. So it doesn't mean anything. It means I have 13 days to get my tail in gear - my tush in the water and my legs on a bike or run.
It means no more lollygagging.
It means I have to buckle down and get to work.
It means I need more cliches to describe an increased intensity in training.
Encouraging speeches, bribes and other tokens are welcome. If you see my running around Roanoke wearing a bathing suit, yes, a bathingsuit, don't stare or laugh, please. Just ignore me and let me brick in peace.