The crossword solution for the term 'UP (INVIGORATES)' is PEPS. PEPS stands for Positive Emotions and Psychological Strength, which are two of the main components of psychological well-being. It is a concept developed by researchers at the University of Pennsylvania to measure the level of psychological well-being in individuals. The idea behind PEPS is that positive emotions and psychological strength can help people cope with life's challenges and lead to greater overall happiness.