Coconuts and Kettlebells writes an interesting take on the elusive 6 pack!
"Although the visual achievement doesn’t correspond with increased functionality, having a well-defined rectus abdominus has become a symbol of health, strength, and success, and many equate its existence with certain physical and sexual appeal."
Personally, I like to approach exercise as part of my day to day routine, it's just something I do. Like cleaning me teeth, if I don't do it my breath smells and my mouth feels horrid; same with exercise, if I don't do it it get cranky, I feel lethargic and get a fuzzy brain. Getting a six pack might just be a bonus, but of no real health benefits.