Top Definition
A community and method of practicing extreme physical fitness, often of a functional variety, which has a high focus on intensity and character development. It also tailors more towards elite military groups and not wasting time with people who need a lot of coddling. Fatal Fitness, sometimes abbreviated as "FFitness" or "FF" , is often confused with crossfit, or accused of being a ripoff of same, however, FFitness's methodologies are markedly different from other functional fitness methods. (See also Death Certificate)
I did the Fatal Fitness DC today, and holy shit was it a ball-smoker!
by jundie August 29, 2008

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