Fleetwood High School cheerleader Samantha Colelli, 17, a senior at Fleetwood, does a basket during halftime at a game in 2017. As cheerleading has become more ambitious over the last decade, it's ...

Dr. Amy Xu got hooked on cheerleading in the fifth grade. As she pursued the sport in high school and college, she witnessed how the routines started demanding increasingly complex acrobatic feats — ...