Motivation means “feel like it.” If I wait until I’m motivated, or feel like it, then I’ll put off moving. I might never feel like it. As much as I can, I simply start moving, believing that the relationship is biconditional, that my movement leads to feeling like it. It works well for self-discipline.
When working with others, when leading, I find it helps to aim to motivate first. If it’s a directed relationship, like boss-to-subordinate, then pushing or move-first sometimes leads to motivation. Pulling or motivate-first seems to work better.