Assuming you don't have a job that requires lifting very heavy things, what benefit is there? I've thought about it off and on over the years and always conclude that the main results would be a dramatic increase in my food budget and having to buy all new clothes - not to mention the loss of free time spent strength training that could go to say practicing guitar. Do people with more muscle mass live longer or have fewer issues with heart disease? I know they tend to have more back/knee/etc. problems merely from carrying around so much more weight, but maybe there is some big health benefit that offsets it. What am I missing?