The 2021 PBA Strike Derby presented by Pabst Blue Ribbon again showed how the event is more complex than it appears, even if it is mind-numbing to watch. It most certainly is a test of physical endurance — if you don’t believe it, take a 15- or 16-pound ball and throw 15 or more shots in 2 minutes and tell me how you feel. And realize that the results of the shots matter, not just how many you get off. Then do it two or three more times in a 2-hour period. But the competition also...