For football teams, time is an extremely precious commodity. Whether at the collegiate or professional level, league rules restrict how long players can spend on the practice field, getting every pass, blitz, and block right before game time. As a former player for Stanford University, Derek Belch knows these limitations well. So two years ago, he co-founded STRIVR Labs, a startup that uses virtual reality. Players can run VR simulations to rehearse specific formations, and coaches can get a first-person view of what their quarterbacks or running backs experience during a play. For the 10 college and six NFL teams now deploying STRIVR’s VR technology, it means being better prepared for on-field action without having to spend extra man hours on the field.