When I was a teenager, my mother used to deal with my sister's dour outlook by
admonishing her simply to "Cheer up!" Mom, a former cheerleader, was quite
cheerful, even chirpy, in her approach. Sis was irritated to no end.
At the time I understood her irritation but now, as a result of my Chi Kung
(qigong) practice, I see that Mom really was right about this.
To understand my reasoning you must practice enough qigong or neigong to experience at least a little movement of chi (qi) in your face. Having achieved that, add this step to an appropriate point in your practice (go ahead and try this even if you are a beginner):
Smile. Turn the outer corners of your mouth lightly upward. Feel the qi
radiate across your face to your ear lobes, and up to your eyes. Smile with
your eyes and feel the qi spread further across your face and scalp. Exhale out any negative feelings and inhale in, drawing in positive qi to seal out the negative.
While I often practice smiling in the context of a larger exercise, there are
times when I do this in isolation. At times when I am feeling stressed and
worrisome, if I think to smile, I can make it all go away. I smile with the
intention of massage my face with gentle, smiling qi, and suddenly
everything changes for the better.