[iamben]

I expect this thread to fill up with many people saying the same thing (meditate, good food, etc) - largely because (generally) it all works.

So I'll just throw in 2 things that make a massive difference (along with the meditation, eating well, etc) to me.

Sleeping - especially now I'm a little older, sleeping ~7.5 ish hours a day is pretty important. Far more so if I've been drinking, far more so if I'm stressed. Anything less and I'm not operating at full capacity, if I oversleep I end up tired again (ironically).

Exercise - I gym almost every day, usually every morning before work Monday - Friday (and twice a week in the evening I do a martial arts class). I've been doing this a long time. I've also noticed that in my super busy periods I'm really good at telling myself "I don't have time for the gym." Sadly and noticeably I become progressively less productive when I stop the exercise. It's definitely my number one thing to balance mind / body / productivity.