Simply your actions, so you do not clutter your mind. Did you ever see a child multitasking and whistling and humming at the same time? Children are in the moment, and when they do something so simple like digging a hole, they dig it with complete attention and are mindful of what they are doing. Their minds are not somewhere else. Doing many things at one time wastes your present moment awareness and mindfulness. Even boring things like washing your clothes and folding them. If you are hurriedly doing even boring chores, everything becomes a hassle and a difficult endeavor. By mindfully practicing everything you do, you become more efficient and productive.
When a child does something kind, do they run off and tell everyone they meet what good they did? In doing so yourself, you are cheapening the good act. As they said in the Bible, when you do a good act with one hand don’t let the other hand know what you are doing. You will feel so much better about doing good.
Do you remember when as a child you didn’t get upset if someone else angered you? At least, you didn’t get that angry, or as often. And you certainly forgot about the incident rather quickly (maybe you didn’t get angry because when you were young everyone was so much older, and bigger and stronger than you, but you get my point). You internalize so much as an adult that you bring your mind to a boil so quickly.