Not taking the time to read all of the original comment provides a nice compact example of the point. Perhaps you were too busy lifting? (I'm being sarcastic, please don't take offence!)
> What are you doing with all that time?
Working! Why are you spending all that time screwing around? You've just told me you have another 10 hours a week you can be working that you use exercising. And another 30 hours a week you spend watching movies and playing guitar! That's like a whole other full-time job you could be putting into work! (for the record I'm being very sarcastic)
In responding to dec0dedab0de's original comment, I agreed that I share his superficial feelings -- but I don't think those feeling are right. My point is that while for some people like myself, grinding as hard as possible as long as possible, is both natural and not healthy. For some people, work is not naturally the thing they spend all their time on, and they gravitate to other things as soon as the clock hits 8 hours for the day.
For people such as myself, my natural tendencies to overwork can, at times, unfairly extend to other people and I often have to resist the temptation to think that they should be doing the same as me -- and if they aren't that they aren't putting in 100%.
These are very unhealthy thought processes and one that I personally have to spend time, effort and discipline to temper. The problem is, for me, work is fun.
On the flip-side I've also really worked with people who become incredibly unreliable at work (during normal work hours) while they train for <sporting event> and it's absolutely intolerable. I also say this as somebody who intensely pursued a sporting activity very heavily in my younger years at about 20-25 hours a week. People really minimize the amount of time they spend doing these things.
And to dec0dedab0de's original point, I've also worked with people of impossibly limited technical capability who fly up the corporate ladder, often to disaster, because they have good looks and dress well.