I was at the gym lifting 20 pounds, I never stop my workout at 13, 13 is bad luck. When I am doing squats, I don’t do 3 sets of 13. I do 3 sets of 20 well moral of the story is 13 is bad luck. A guy started lifting heavy near me. He ended up giving up on the number 13. I told his friend that I over heard that he stopped at 13 and that’s a bad luck number. He should try for 15. The guy was walking in the guys locker room then I said with my eyebrows rolled up,”I over heard you stop your workout on the number 13 and that’s a bad luck number.” His names Malcoln, he ended up finishing his rep of 20. Proud of Malcoln.