The love of the outdoors keeps me motivated and interested. I walk 3-4 miles a day, and also do one or two of the 7 minute workouts at home and do some weights at home while watching TV. I stay aware of not sitting for too long too.
Reading what others do is also very motivating. Annie, you're awesome!
Edited to add: I'm one of those who loves tracking fitness data, so that I can see totals for the week and month, and this provides motivation as well. Being able to see a month view totally shames me into not getting lazy and taking days off unless the weather is horrible. There are many fitness tracker options, and I use an Apple Watch. Not only will it track my route on a map automatically but I'll get total steps, miles, heart rate, elevation gain, pace, temperature and humidity for that workout, active calories (based on my height and weight), and other data. It's fun to compare and visually see improvement on the same trail over time too. It also has an hourly stand reminder, so I can see how many hours in a day I stood for at least a minute. I aim for 12 but it doesn't always happen.