By LARRY LAGE ANN ARBOR, Mich. — Riley Ammenhauser has become a record-breaking, triple-jumping track athlete at Michigan and something of an entrepreneur. Leveraging her value with about 250,000 followers on social media, she has landed endorsement deals with Peloton, Gatorade and Lululemon while potentially setting herself up with a career as an influencer after hanging up her […] Read this story