‘Rexes are offensive guys, right?’: Why Preston Rex made the move from safety to running back for BYU
Former safety Preston Rex ready to roll at running back for BYU in 2026 as one of LJ Martin's backups.
BYU running back Preston Rex, a former safety, made the surprising move to running back last summer after a conversation with BYU coach Kalani Sitake. The 6-foot-1, 200-pound senior, who initially felt stunned by the proposition, found himself embracing the change, stating, "I am like, ‘Hey coach, what are we doing here? Are you serious?’
But he was serious, and here I am." Rex's brother, Isaac Rex, and father, Byron Rex, were supportive of the decision. Despite not being the starting running back, Rex has been a quick learner and shown his versatility by catching passes and blocking. He appeared in 12 games during his first season, contributing 13 carries for 30 yards and three receptions for 50 yards.
BYU offensive coordinator Aaron Roderick praised Rex's progress, noting his improved understanding of the offense and his readiness to fill in where needed.
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