The brace created by Exo Dynamics aims to help doctors avoid back pain. The company, started by a University of Michigan Ph.D. student won $15,000 through the Michigan Business Challenge.Ben Freed | AnnArbor.com file photoThe Michigan Business Challenge and Dare to Dream program recently awarded more than $110,000 to student startup companies at the University of Michigan. The programs, part of the Zell Lurie Institute for Entrepreneurial Studies, award $200 to $1,000 grants that are funded by alumni and partnering companies.