This is made up of 8 drawings shot on two's. She's basically just jogging along comforably here. I tried something a bit different with the action and timing. If you look closely, her body and arms are moving to the beat of her foot steps but her bag and pony tail are bouncing on every other.
When I originally did the roughs, I had them all going at the same beat but it looked really weird and fast. Slowing them down to half the speed worked out pretty good.
As you do your own animation you will find many opportunities to do the same type of thing. Don't be afraid to experiment.