Semi Finals 1
- Episode aired Feb 4, 2017
The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.