Before the stats of Justin Fields "Impossible" season, here is (another) video of Justin Fields in some of the practices in Arizona right before the CFP semifinal against Clemson. It shows his mobility on his knee (somewhat):

Justin Fields is Impossible! Here are some amazing stats about Fields' season so far. (Note: The names listed on the charts are just the odds, so the second place names he says are not named on the list. #1, #3, #5 and so are listed and not #2, #4, #6 and so on):

Bonus Video: Justin Fields Throwing Mechanics When On The Run: