Examine the tweet "This tweet is dedicated to my back pain, which I do not understand because I am youthful and spry. Full of life. Vivacious." and determine which of these emotions are present: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If there are no identifiable emotions, reply with "neutral or no emotion".
joy, optimism, sadness