I recently started a quest with my 16 year old son to complete three endurance obstacle course races within one calendar year. The shorter of the races is three to five miles with 20-25 obstacles; and the longest is 12 to 14 miles with 30-35 obstacles. Then there is one somewhere in the middle of those two. One really important piece to know is that you don’t really know how far the race is or which obstacles you will encounter until race day. Some obstacles are even kept secret from you until you round a corner and see it in front of you.