When we do fitness as a family, there are often exercises that involve rolling, tossing, bouncing or kicking balls. Naturally, when Emma and Irene see them, they want to play, so we spent a few minutes earlier in the week letting them do just that.
We did work with Emma on catching as well as kicking.
Irene, however, needed no encouragement to throw herself at the ball as soon as it came near. :)