We asked Crouser personally and he told us about it.
In this article:
Shot Put: 2014 USA Indoor WC Trials | Throwholics
“Yeah, for me it just doesn’t work very well into the schedule for conference and then NCAAs. Also, being in school it would be very difficult to miss over a week of classes. My training is focused more towards outdoors and peaking for an indoor championship would compromise some of my outdoor performance. I am also trying to bring my discus up more proportional to my shot so this year I am putting more emphasis on outdoors.”