There are, thankfully, many ways to keep routine and structure interesting. If you are someone who enjoys yoga, there are many different methods to choose from, and different positions to choose from within one method. If you enjoy running or walking, there are as many paths to take as there are days in the year. Keep variety as part of your routine so that you do not get bored. It's best to limit your choice of times, however: choose a morning and an evening time and alternate between them.