Well, my youth was filled with baseball, football, running and hiking in the National Forest I grew up on the edge of. I had to walk a mile and a half to the nearest kid's house I was friends with, so we rode bikes and ran around pretty much constantly. Later, I did a PT regimen through high school ROTC and early college ROTC, and started weight conditioning.
In mid-late college, I mostly participated in binge-drinking and extended periods of laziness, occasionally interrupted by the aerobic activities of chasing women, keg parties, and walking/biking to classes with horrific early morning hangovers.
My post-college life P.K. (pre-kids) was such that I played indoor soccer/raquetball/flag football off and on, did Shinkendo (kenjutsu) twice a week for 2-3 hours, did olympic fencing for about 5-6 hours per week, did at least 2 or 3 3-5 mile runs per week, and on top of that did a weight conditioning program to help condition me for the above activities. 5-6 years ago I was in the best shape I've been in since early high school. After kids and jobs where I had to travel a lot (forcing me to quit most of the hobby sports/martial arts for a few years) I have more weight on me than I'd like (but not too much), and have recently been attempting to get into better shape mainly so that I don't, you know, die.
So I decided to eat less, drink less beer, quit smoking, get more rest, and change jobs to one where I can learn new things and that I am more challenged at by essentially having to do things I havent done much before. I've started going to the gym in our building at lunch at least 4 times per week during my lunch hour, doing a modified super-set weight regimen to pack in as much pain as it possible in about 45 minutes at only a fraction of the level I did it at 4-5 years ago, and I run/stair step/walk/swim at least 2 miles/30-40 minutes 3 times per week (I have to mix it up because of an old sports injury to the knee and back which are troubling me more now that I've turned 35). I play disc golf (lots of walking with hills), raquetball when I can, and go for fast walks in my hilly neighborhood pushing a double stroller full of children who keep asking me why I'm breathing so hard.
The results?
Well, to be honest, it sucks.
I want a cigarrette so bad I could chew through the arm of my desk chair for one. I'm hungry because I'm trying not to gain 20 lbs while quitting smoking, and quitting smoking makes the desk chair arm look quite appettizing. I'm taking Zyban to help me quit smoking, which means I've all but eliminated my alchohol intake (bah... how bad could a brain seizure be anyway?), while experiencing my emotions as if being sucked through a large ball of styrofoam that is stuffed over my head. Wrapped in plastic. The Zyban, however, has had the positive effect of me not actually maiming or killing anyone for committing horrendous offenses such as asking me what time it is

. I've cut my caffeine intake because I'm tense enough quitting smoking, and eliminating smoking makes caffeine a lot more intense for you, so not much coffee these days either. The workouts have helped with the quitting smoking in that they also make me cough up pieces of something that I swear are my pancreas and make my lungs hurt, along with quite a few other muscular bits that I've forgotten or let atrophy a bit. Every couple days I'll switch up my conditioning so that I can discover an all new muscle group that I've been stupid enough to ignore for far too long, and then wonder why after quitting smoking my body has decided that it should produce 5 times the mucus that it did BEFORE I quite smoking. My guess is that I'm shedding the lining of all the internal organs that smoking/drinking/bad food have corroded. Of course, since I'm fitting in that much more activity and a new somewhat-stressful job (that I like) with lots of extended hours I have much less time for leisure activities or rest, which with a wife and 3 young kids wasnt very much to begin with, so I can't tell if I'm sleep deprived because I havent had the luxury of more than 5 or 6 hours of sleep at one time in so long I've forgotten what it's like.
So all in all, it's not that bad, the road to better health and all that. Though I am now convinced that I'm a bad haircut, an orange robe, and a brass bowl away from a one-way ticket to Tibet with all of the denial that I've been putting myself through lately.
(ok really, it's not that bad. I am having a craving filled morning, and so far all I've filled it with is work. Mmmmmm yummy work, ah so satisfying)
