Kinda a boring one but gym. Started a couple of years ago once a week and had to drag myself there but after a month or two of that something flipped and now I go almost every day. It's pretty fun and it's great to notice the change in myself over the last couple of years. Now just need to do something about diet and sleep.
I second this. I am bad at breaking my habits or starting new ones so I just started going every weekday starting around the beginning of this year. I also started eating healthier. I feel freaking great. Lost 25lb, way more energy, joints don't hurt as much... A lot of the "well, getting old sucks" things just went away after a while. Now that I've started the habit I have trouble not going to the gym.
That's awesome! I was surprised at the shift between having to push myself to go vs having a natural pull to go. Definitely makes a huge difference and seeing/feeling changes happening is so motivating.