I started the habit of taking a walk every day after work, because I suspected that not getting any exercise was a drain on my happiness. I also started rewarding myself for noticing my posture and straightening up (and put a reminder in my cube to do so), and it seems to be working so far.

I also started doing GTD-style weekly reviews again. Only done it once so far. I've previously failed at this because other commitments came up and it became impossible for me to do it at the same time every week, as I was trying to do. So this time, I decided to treat it like an appointment with another person: somewhat negotiable in the exact timing, but still high-priority. I'm very reliable with those, so hopefully the remapping will make me more likely to do it.