Last night I was playing tennis on holiday with my husband in Miami. He is a MUCH better tennis player than I am - so I was missing a lot of shots as his balls are very powerful and difficult for me to time. As I got frustrated - I noticed my thoughts and physical sensations. My knee hurt, my foot hurt, my ear hurt and I felt lethargic. I realized that I was bringing myself down and I picked my spirits back up. I reminded myself how lucky I was to be out in perfect weather playing tennis with my loving husband. And as I shifted my perception of the situation from "I'm a loser" to "I'm so lucky" my ailments magically disappeared from my consciousness. Maybe they were still in my physical being but I didn't feel them anymore.
And of course - then I started playing better and felt light on my feet.