yup if i tell myself “i will watch my favorite show after i’m done with this task” i can’t focus on the task because i’m too preoccupied thinking about the show  what works better for me is “i will watch one episode of my favorite show before work to put myself in a good mood and to feel like i’ve had my share of fun already then i will do my work then when the work is done i will watch another episode or two of that show”  but i 100 agree with you it’s much better to use intrinsic motivation to do a task rather than extrinsic