For physical workout burnout we need to listen to our body. Once we get going with our workouts and experience how great we feel, it's easy to forget about the importance of pacing ourselves. We want to push ourselves, which is great! It is equally important to allow our body rest time for recovery.
Workout burnout that is more related to emotion and how we feel is different. We make a commitment for example to begin exercising 3 times a week. Time comes to make good on our promise and our head tells us we don't want to. Keep your self-promise! Once you get the workout in, you will feel so happy you did!
There is also the case of boredom that can feel like workout burnout. To avoid this always be sure you are enjoying your workouts. The moment you are no longer enjoying a type of workout, change it up. It should be fun and really something you look forward to. Course-correct as frequently as needed to always keep it enjoyable.