First, the call to Rise Up applies to all of us. We need to be better than we have been in the past. We need to be constantly working towards making ourselves better and bettering the world around us.
Secondly (and most importantly) just like the BYU football team, we need to remember that we can still do our best in the future, despite our failures in the past. Because no matter how often you do this...
...people always want to remember this...
But no matter how many mistakes you make in the past, you can move on. And you don't have to be haunted by the mistakes of the past anymore (D&C 58:42).