" High fives and fist bumps have become the popular alternatives to traditional handshakes, especially among the younger generations. As a new social norm, they are used as a greeting, an approval, an acknowledgement, a celebration, and a gesture of understanding. High fives and fist bumps are also viewed as a healthier alternative to traditional handshakes because they don’t spread germs. "

― Susan C. Young , The Art of Body Language: 8 Ways to Optimize Non-Verbal Communication for Positive Impact (The Art of First Impressions for Positive Impact, #3)