The highest-return habit for me is two minutes of morning light: I open the blinds and stand by a window or step outside while the coffee brews. It wakes me up, lifts mood, and helps sleep later, and it's so easy because I link it to making coffee. I also keep a full water bottle next to the coffee maker and finish it before the first sip, which fixes the "forget to hydrate" problem without thinking. A 60–90 second tidy sweep once a day helps surprisingly: set a timer while the microwave runs and clear counters or put stray items away. And I keep shoes by the door and take a five-minute edge walk right after lunch, which reliably bumps energy without feeling like a workout. Tiny environment changes stack well: phone on grayscale, social apps on a second screen, and a recurring Do Not Disturb schedule so evenings feel quieter by default. When I feel tense, I do three slow box-breaths while waiting for the kettle or at stoplights, which is just one minute and noticeably resets my brain. I've put a sticky note on my lamp that says 3 good things, and I mentally list three wins of the day as I turn off the light; it's quick and ends the day on an upslope. Before bed I prep one thing for tomorrow—lay out clothes or pack my bag—so mornings start with momentum and one fewer decision.
The key to making these stick was pairing each with an existing anchor (coffee, microwave, lunch, lamp) and keeping the bar laughably low so I never talk myself out of it.