look at it this way long distance runners can expect an enlarged ventricle as an adaptation, but that's not necessarily healthy or desired.
not all adaptations are desired, healthy or effecient for longevity
http://www.govtech.com/internet/Googles-Anti-Aging-Project-Calico-Web.html
you, i and baron might live long enough to live forever. imagine ET in yr 2200!
117 combination of genetics, luck, lifestyle...and he didn't BB ;)
the problem with BB is leads to harmful excesss.
a single set of HEAVY barbell curls lead to considerable disruption of myofibrils. aka, damage.