1) Street dance 2) Warming up for gymnastics 
[dance] Flexing, also called Bone Breaking, is a style of street dance from Brooklyn, New York that is characterized by rhythmic contortionist movement combined with waving, tutting, and gliding. Flex dancers, referred to as flexors, often perform shirtless and incorporate hat tricks in their performance for showmanship. Flexing is primaril...
• (p. pr. & vb. n.) of Flex
Condition that can occur on a die when the die circumference is less than the width of the cross-blades. Causes the center of the cross-blades to fail to cut properly and consistently.