Classify the emotions found in 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.". Select from the following: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If the tweet is emotionless, reply "neutral or no emotion".
joy, optimism, sadness