UCF director of sports medicine Mary Vander Heiden and head strength and conditioning coach Zach Duval diligently worked through a process of elimination for the past year to figure out why the young offensive lineman was always running low on energy, reports The Orlando Sentinel.

Last year, Duval ordered Omegawave devices for athletes to measure the time between heartbeats. This allowed him and his team to determine how much stress the athlete’s body was under. His team recorded each player’s results every day for the past year to have a database to track changes.