There's some weightlifting guru named "Doggcrapp" who put out a bunch of papers summarizing his thoughts on weightlifting and eating.
Here's an excerpt from his seminal work called "Cycling for Pennies":
Bodybuilding is an attempt to build yourself up to what you consider to be a physical ideal, and for more AE readers than not, that means brutally huge size. Brutally huge size is the result of two primary actions 1) brutal workouts and 2) a brutal eating schedule.
I've never heard brutal used as an adjective to describe anything other than violence and it's synonyms. He used it to mean something like "awesome" in "brutally huge size" and "tough" in "brutal workouts" and "brutal eating schedule."
I thought it was funny and took it as my username.