No particular order, but here is what I've been trying to adopt for the last 18 months:
1) Getting 8 hours of sleep each night. I used to stay up past midnight on the weekends and it completely threw me off. Now, we stick to a fairly tight schedule (in bed by 10/10:15, up by 6:30 at the latest during the week). Sometimes we stray an extra hour or so on the weekends if we're meeting up with friends or whatnot, but it makes it much easier come Monday morning to get up. I track, roughly, my sleep with a Fitbit.
2) The Fitbit has helped me to be aware of how sedentary I can be if I'm not paying attention. We take the dog on walks. We moved so now we bike/walk to work (about ~1 mile each way). We try to keep ourselves active when not working. Just generally being aware of moving around and not being a blob on the couch for 2-3 hours at a time.
3) I went vegan at the start of last year. I wasn't overweight or unhealthy, but through friends/family having dietary issues, I started researching more about food and specifically food consumption in the U.S. My diet was pretty typical of a western diet - a lot of cheese, a lot of fast food, a lot of processed foods. I wasn't a big meat eater anyway, so it wasn't a huge transition. I started cooking more (still learning!) which caused me to buy whole foods at the store a lot more. So now I focus on whole foods, plant based when I can. That is probably 2/3 to 3/4 of my diet now. We only buy whole wheat bread/bagels/etc. We get the reduced sodium sauces if available and unsweetened soy/almond/non-dairy milk. So we also try to watch the extra "crap" - sugar added, too much salt, too many chemicals/preservatives. Obviously we eat no meat, dairy, or eggs but also try to reduce carbs, sugar, and to some extent salt as well as "crap" - if I read the label and I can't identify 2-3 of the ingredients because they're chemicals, I'll probably pass. All of this has yielded some health benefits for me, but I know there isn't a diet that fits everyone's needs/lifestyle.
3) I supplement with a daily multivitamin and B12. Also take a probiotic pill and vitamin D3 every few days.
4) Always looking to improve. We don't extensively research, but we do read up on new findings/studies or new products friends or family might recommend.
5) Meditation/mindfulness. It's hard, but we do our best to try to keep calm after a stressful day or anything like that. We will utilize the "head space" guided sessions if needed. Used to do yoga for this (and the physical benefits) as well but we have not gone regularly, largely due to cost.
6) No soda/pop/juices. Water is what we drink 90% of the time. Do have coffee in the mornings, but just a cup. Drink limited amounts of alcohol now, and mostly just Fridays/Saturdays if we do at all.
7) No smoking - this is a given, but thought I'd list.
