I am pretty energetic and my routine is a bit like this:
Sleep about 6-7 hours a night, get up approx. 5am.
Work on farm until 8ish (usually pretty physical work unless its harvest time and all I'm doing is driving machinery - but then it's 20 hour days).
Back to house, brekkie (sometimes Weetabix and fruit, sometimes cooked), take kids to school 5 mins down the road.
Back to work until 6-7ish, usually
Home for dinner , usually home cooked.
Either have the evening off on which case I might run to clear my head or read a book (depending how tired I am). Sometimes back to work for an hour or two depending on the time of year.
I should be knackered all the time but I believe what keeps me going is partly a good diet - lots of protein rich meat, plenty of fresh fruit and veg, the right kind of carbs to keep me working. I almost never eat processed food or ready meals, pretty much everything is made with fresh ingredients.
I don't smoke, don't drink much unless it's a special occasion.
The biggest one for me though is lots of leisure time. Even when life is busy I protect my 'me time' fiercely. Sometimes it can seem to others as if I'm just being a selfish bastard buggering off shooting / biking / playing rugby when I really shouldn't be. When we had the DC's I did drastically cut back on my leisure time and try and pitch in more with them but I just got run down and ill.
I can't overstate the importance (in my experience) of taking some regular time for yourself and SOD EVERYONE ELSE.... Seems harsh but ask yourself 'what would happen if I were in bed for a week ill?' the world would not stop turning, no one would die, so you can take a couple of hours to go swimming or to the gym or just out for a coffee with some friends. It'll do you good.