More information on general Champions rules can be found here.
Participants in Champions contests are competing for the Champions Prize, the share of which is determined by the number of Champions Points accumulated by participants in the contests. The more Champions Points your winning entry accumulates, the greater your share of the Champions Prize.
To win a share of the Champions Prize, based upon Champions Points, you must first have a winning roster. This typically means either accurately predicting how all of the athletes in your roster will perform, or if you choose to flex your Champions contest entry, that most of your predictions will be accurate as shown at the time of entry.