You don’t have to feel like it to start. Feelings are late to most parties.

Motivation usually arrives after the first few minutes of work, which means waiting for it is waiting for something downstream of the action. The order most people assume is backwards. You start badly and unwillingly, and somewhere around minute five the willingness shows up and takes the credit.

Set a timer for ten minutes and begin the thing you do not feel like doing, with permission to stop when it goes off. Most times you will not stop. Treat the absence of enthusiasm as normal rather than as a signal about whether to proceed.