12. Commit To Improvement
I've seen many good small things, but I'm going to toss out an elaboration: incremental improvement, and a baseline task.
The baseline task is something you have to do every day. Sick as a dog? Get it done. Groggy waking up? Too bad. Slept late and will be late for work? ...do it as soon as you get home!
This can be anything. Making your bed, searching your room for clutter for 5-10 minutes, doing 30 minutes of yoga before work, etc. All it has to be is some small task, preferably at the start of the day that gets you up, thinking a little, and moving around. Set one alarm clock. Two for safety. Setting 10 only hurts you.
I chose to do the yoga, and it pays dividends. I'm up earlier than I would be otherwise, and more alert. I have the time to make breakfast afterward. I can spend the first 30 minutes at work alertly setting up the day instead of docking around while I wake up. If I happen to miss that days "real exercise" (and to be clear, I definitely saw some weight loss/strength gain from the yoga after ~6 weeks) I don't feel like it's a total bust.
From there, pick something else. Brush your teeth, twice, every day. Then pick up flossing. Then pick up using mouthwash. Maybe invest in a tongue brush. Make your bed. Go for a jog. Spend 30 minutes reading. Add one of these things every week or two, not all at once. Make one a habit, then build on it.
Some days, you'll be busy, or tired, or you'll want to binge watch Netflix instead while eating Doritos. And that's fine! Being a robot is a bad thing - you'll find that on those days maybe you missed your jog, you ate out dinner instead of cooking, and you played video games instead of reading...but you still made your bed, still did yoga, and still took care of your oral hygiene. Good job!
What I'd recommend that I'm sure you can find throughout the thread to add one thing every two weeks:
Do yoga for 30 minutes right when you wake up. Every. Single. Day.
Make your bed. As fancy as you want - I straighten the sheet and place my pillow properly.
Brush your teeth if you aren't already. At night, then in the morning.
Floss at night
Use mouthwash (enamel-safe, anti-cavity whitening is best) after breakfast and before bed
Go for a 30 minute to one hour bike ride every other day. Or a swim. I recommend these as they're non-impact cardio sports; get into running once you have the diligence and cardiovascular endurance.
Pick up some kind of 30 minute to one hour lifting routine to do 2-3 Times a week (I recommend starting strength or the reddit Recommended Routine).
Find a 10-minute chore to do, every day. You can watch Netflix while you do it. Vacuum the floor, get your clothes in the bin, wash those three dishes, etc.
Imagine where you'll be in six months. You'll have good hygiene, be more flexible, be in great shape, you'll have a clean living space, and god knows what else you've done!
Tl;Dr: Pick one good thing to do every day. Always do it. Pick another good thing to add next week. Repeat for three months, then hold onto them. Don't get discouraged.