Bradley Roby participates in an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY.(Ben Liebenberg/NFL)

Texas A&M Quarterback Johnny Manziel and Ohio State University Running Back Bradley Roby participate in an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

Eric Ebron participates in an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

Michigan offensive lineman Taylor Lewan participates in an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

NFL Draft prospects huddle with fans during an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

NFL Commissioner Roger Goodell speaks during an NFL event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

South Carolina's Jadeveon Clowney, left, Clemson's Sammy Watkins, center, and Buffalo's Khalil Mack participate in an NFL event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

Louisville's Teddy Bridgewater celebrates with kids during an NFL event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

Texas A&M's Johnny Manziel is surrounded by media during an NFL event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

Texas A&M wide receiver Mike Evans plays with a fan during an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

Texas A&M quarterback Johnny Manziel plays flag football with fans during an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

Louisville quarterback Teddy Bridgewater plays flag football with a fan during an NFL Play 60 event at Chelsea Waterside Park on May 7, 2014 in New York, NY. (Ben Liebenberg/NFL)

South Carolina's Jadeveon Clowney, right, and Clemson's Sammy Watkins teach tackling technique during an NFL football event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

Central Florida's Blake Bortles, right, runs drills with kids during an NFL football event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)

Louisville's Teddy Bridgewater, left, and Texas A&M's Johnny Manziel participate in an NFL football event in New York, Wednesday, May 7, 2014. The event was to promote Play 60, an NFL program which encourages kids to be active for a healthy life. (AP Photo/Seth Wenig)