The short answer
Short movement bursts can break up sitting and make consistency easier. They are a practical starting point, not a lesser workout.
Make one automatic
Attach a burst to something you already do: three brisk minutes after lunch, one comfortable flight of stairs before coffee or ten chair stands when the kettle boils. Repeat once or twice.
Build from there
Tiny sessions are not magic, but they count. Gradually work toward the weekly movement and strength guidance in a way that fits your health and ability.