It usually involves some combination of the following:
Make a time slot. Could be 10 mins. Could be an hour. It doesn't have to be big to make a difference if its regular.
Make the environment appealing. I favour outdoor, including boot camp weight classes. At home, my chances of doing yoga go up if the floor is clear and recently vacuumed.
Make it easy. Have the equipment/ clothing organised and easy to reach for. Is less preparation better (e.g. not needing to change for a walk compared to faffing with sports bras for a run)
Make it purposeful. Do functional walking. Have a long term goal e.g. train for a race or to lift a certain weight.
Make it social. Do it with a friend, a class, an event. Use social media to share with friends with similar goals, or fb groups, or forum threads.
Make it multi-purpose. Use the time to mentally do something else, watch TV, audiobook, think over a problem, have personal time.
Find something that makes you feel good, either as you do it e.g. enjoying seasons changing outside, or the feel of a yoga flow, or something that gives you endorphins or the satisfaction of ticking off a challenge or seeing measurable progress.
Make it accountable. Set goals participation/ outcomes. Record what you do; sports watches can help a lot. Keep a log. Talk to people about your intentions. Sign up to do an event that you have to be ready for.
My week's been totally off-piste. As a runner with an intention of signing up for a race in a month, it was not constructive... but I've been out and about doing active things with DS. I've done a lot of functional walking and tasks. It's actually been a busy active week, just not in a formal plan way, and it's been interesting and fun. Looking at my watch and noticing I've done something recordable each day makes me appreciate the value of what I have managed.
I like a bullet journal log of what I do. Garmin/ strava are great for logging activities, but logging it on paper is great for the big trends and long term goals, and I like the creativity of setting it out and filling it in. DH is Spreadsheet Man.
And the fun activities I did with DS were because of the fitness stuff that gets built into each week, that makes it easy to still climb/ cycle/ swim/ jump/ sprint etc in my mid-40s.