Stephen Amell, who is scheduled for a tag team match at SummerSlam, was injured in doing a weight workout this morning.
According to a video he posted, Amell was doing a snatch, which is a lift where you take the bar from the floor to overhead without pausing at the shoulders (which would be a clean and jerk or clean and press). When doing the lift, he ended up smashing the bar into his jaw.
He suffered a cracked jaw, his molars were indented into his tongue and his tongue was swollen. No word on how this may or may not affect his match next week.