I remember when I was a kid, my mom went through some severe depression for a while. Her doctor knew it would be far too overwhelming to advise her to "start walking." So he told her to just get up and put on some tennis shoes. She did just that, and then a tiny bit more when she was able (standing in the front doorway, walking around the block), and that was the beginning of her recovery.
To this day, if I choose to put on tennis shoes instead of the flip-flops, inevitably I'm more energized and creative for the whole day.