Endurance WOD 1-12-20 By Jessica FitzgibbonsJanuary 12, 2020January 12, 2020WOD “Black Jack” 21-1 push up 1-21 sit ups ** do 10 air squats between sets FOR EXAMPLE: 21 push ups 1 sit up 10 air squats 20 push up 2 sit up 10 air squats ETC..