A Russian powerlifting champ fractured both his knees and snapped both his quads in an 800-plus-pound squat attempt gone horrifically wrong ... and the video is TERRIFYING.
The awful scene all went down when decorated weightlifter Alexander Sedykh stepped up to the bar at a World Raw Powerlifting Federation event near Moscow this past weekend.
Sedykh -- the event's champ just a year ago -- loaded up 800 KG (roughly 880 pounds) on the bar ... and when he went to squat it, things took an awful turn.
WARNING: THIS IS GRUESOME.
In the video, you can see Sedykh's legs wobble .