Several Texas high school football players were hospitalized after their coach allegedly forced them do 400 push-ups as a form of discipline, and that coach is now on leave, according to multiple reports.

The principal at Rockwall-Heath High School, which is east of Dallas, said steps are being taken to determine exactly what happened.

FoxNews4 reported that John Harrell, head football coach at Rockwall-Heath High School, was suspended and placed on administrative leave after a group of his players required medical attention following an off-season workout.

The Dallas Morning News reported that at least 8 students were hospitalized. The school district said it hired an “independent third party” to investigate the incident.

The exact number of pushups is not clear, but it’s been described as several hundred, or as many as 400. According to a parent of a child who’s hospitalized, it was 300 pushups during an hour with no break or water.