Minnesota Vikings training camp won't begin for some time yet, but the competition for starting roles has already begun for a number of players working out at the team's facilities.
While rookies such as cornerback Trae Waynes and linebacker Eric Kendricks are busy learning the defensive playbook and becoming comfortable with head coach Mike Zimmer's defense, returning players like wide receiver Charles Johnson are working on perfecting techniques and building team chemistry.
The Vikings may have progressed in 2014, but there are still many areas on both sides of the football in dire need of improvement.