Their most recent efforts, the spring football-centric 'Proving Grounds' series, have lived up to their atypically high standards, and are powerful enough to make even this football grouch yearn for the calendar to speed into fall. If you haven't watched it, I encourage everyone to check out the three-part series, including the recently released third episode. You can also follow them on Twitter @CU_Video. Proving Grounds - Episode I from @CU_Video on Vimeo. Proving Grounds - Episode II from @CU_Video on Vimeo. Proving Grounds - Episode III from @CU_Video on Vimeo. Originally posted by The Rumblings of a Deranged Buffalo Click here to view the article.