World-Class Fitness
in 100 Words:
"Eat meat and vegetables, nuts and seeds, some fruit, little starch and no sugar. Keep intake to levels that will support exercise but not body fat. Practice and train major lifts: Deadlift, clean, squat, presses, C&J, and snatch. Similarly, master the basics of gymnastics: pull-ups, dips, rope climb, push-ups, sit-ups, presses to handstand, pirouettes, flips, splits, and holds. Bike, run, swim, row, etc, hard and fast. Five or six days per week mix these elements in as many combinations and patterns as creativity will allow. Routine is the enemy. Keep workouts short and intense. Regularly learn and play new sports."
-Crossfit-

You can make it more difficult you can argue the finer points....but you don't have too.
It's modifiable and scalable. You don't have to get involved with the politics or you can. I like to keep it simple.
Read that last line
"Keep workouts short and intense. Regularly learn and play new sports"
That's what pulled me in.

I'll add my own line or two.
Try not to be a dick and don't take yourself to seriously! Nit picking is important but complimenting is vital!