Losing weight, lower blood pressure, flexibility, sport specific training, marathon running, lower back pain, injury rehab, bodybuilding...start with the end in mind and work with professionals to craft a plan. 

Bodybuilding/BoxingShooting moving objects with a shotgun/reloadingWelding/fabricatingDrinking beerMaking fun of inferior peopleSabotaging my competition in the R.E. world

And, for many, it's a cycling action much like body builders do of growth, consolidation, growth, consolidation, evolving up along the way. 

I once had a body builder as a tenant and he was very particular about his AC temps.

You have a friend who wants to be a body builder but year after year he/she uses the same dumbbell weights, choosing to never increase them because they are ...

I come from a bodybuilding background.

“Everybody wants to be a bodybuilder, but nobody wants to lift no heavy-*** weights