With advances in testing and technology, the world of professional sports is beginning to use data to evaluate athlete health and to predict — and ideally, prevent — injury. Experts equipped with 3D motion capture technology are now essential members of team training staffs. Are these new technologies and recovery interventions increasing player longevity? Will cost-effective technologies soon help amateurs prolong their athletic lives? Sports scientists and players weigh in on the brave new world of data-driven performance optimization.