I think most of us Gen X'rs might suffer from 'sedentary computer guy' syndrome to varying degrees...except maybe Sir Brian who seems to be pretty active compared to me anyway.
Learning to relax is probably the greatest lesson I took away with me after our impromptu fencing bouts, the second one being cardio is of course, key. It is amazing how quickly you can lose the benefit, even if you do it often...walk away for a while and it tells.
Sir Edward, have a care at pushing your heart rate to the max...it isn't always a benefit. Two years ago, one of the members of my gym, Doug, who was a staunch cardio guy- 4 to 5 times a week, this guy would spend 30 minutes on a stair stepper, 30 on a treadmill- but it wasn't a casual type of workout...he hit it hard, on both machines, nearly every day. Doug was 46 when he suffered his first cardiac episode; he was drenched in sweat, I walked by to change up in the locker room. I come out, and Doug's laid out on the floor, with the stair stepper on top of him. I pulled it off him and his eyes were gone, not there, as he struggled for breath, then stopped breathing altogether. Someone dropped down to give him CPR and I called out the cadence...he'd breathe by himself or a few moments, but then stop again. EMS got there pretty quick but before they did, I learned some critical lessons.
1. The auto-defib machine is exactly that- once you hook up the electrodes, step back. Nearly got myself and the woman compressing his chest a nice zap...I don't know that it'd be enough to harm but better safe than sorry, right?
2. Going and staying at max heart rate for any length of time on a regular basis can do harm, especially as you get older. It turns out Doug was simply pushing himself too hard...had he been doing it on his home gym who knows what the turnout would've been?
I saw him last year...he was thinner, said he was still doing cardio but not at that level and seemed to be in good health and spirits. 65% of max heartrate for fat burning, 80% for cardio- stick with it.
One of the best fat-burner things I do is to set the incline as high as it can go on a treadmill, grab a couple of 5lb weights and walk uphill for 20 or so minutes at 3 or so mph...doesn't sound like much, but I guarantee 5 minutes in you're going to start feeling if not already. I've toppled all the big muscly guys with this exercise...one monster who likes to tell people just how strong he is dropped his weights (he decided to go with 20lbs in each hand) less than 5 minutes in and was holding on to the top of the machine about halfway through. He refuses to do it ever again. lol