There are some good cognitive behavioral strategies out there for "behavioral activation". I just started doing some of this work with my therapist.

My current 2 favorites are:

1) I schedule a particular time slot to do something (start small) and when it's time, I either do it, or sit in the moment and don't do anything ELSE during that designated time. Normally, I would avoid the task and would sleep, watch TV, get on my phone, or substitute some other activity. But this requires staying in the moment and being mindful about that activity. It makes you think, "what is it about this that making it so hard?" It's not an exercise in ruminating or beating yourself up, but an opportunity to get real with yourself about your feelings on avoiding that particular task.

2) I set a timer for 15 or 20 minutes and agree with myself that I can stop the activity when the timer goes off or I can choose to continue if I feel motivated to. For me, it's getting started that is the hardest part.