Cowboys rookie Randy Gregory leaves practice w/ a trainer. RG was struggling through sprints, & was seen vomiting. pic.twitter.com/oR7dXwXRQU

— Pat Doney (@PatDoneyNBC5) May 8, 2015

Here's some AP photos of former @Huskers DE @RandyGregory_4 going through workouts at @Cowboys minicamp on Friday: pic.twitter.com/wu6GMVxMtr

— World-Herald Big Red (@OWHbigred) May 8, 2015

RB @Ameerguapo in action during his 1st #Lions practice. More rookie minicamp Day 1 photos: http://t.co/IP3LU8dsxJ pic.twitter.com/M3apA7QO4N

— Detroit Lions (@Lions) May 8, 2015

RB @Ameerguapo talks about returning punts during his first #Lions practice: http://t.co/C7zyPy5aA0. pic.twitter.com/AFCyX7otvr

— Detroit Lions (@Lions) May 8, 2015

'Pretty good day' returning punts for #Lions RB Ameer Abdullah http://t.co/k1utiGnroJ via @freep

— Dave Birkett (@davebirkett) May 8, 2015

On day one of rookie camp, Buccaneers reporters saw Jameis Winston throw a 50-yard TD to Kenny Bell. Double move.

— Samuel McKewon (@swmckewonOWH) May 8, 2015

Play Bucs fans would have liked the most during 1-on-1s: WR Kenny Bell breaks ankles w/a double move & Winston hits him in stride downfield.

— Scott Smith (@ScottSBucs) May 8, 2015

Here's Bucs rookie WR Kenny Bell (@AFRO_THUNDER80) with Colorado's Tyler McCulloch at rookie minicamp. pic.twitter.com/qvQs7cKm0S

— Greg Auman (@gregauman) May 8, 2015

Here's video of Jameis Winston (@Jaboowins) at Bucs rookie camp practice. Nice deep ball to @AFRO_THUNDER80. http://t.co/td7bPoJ9Vc

— JennaLaineBucs (@JennaLaineBucs) May 8, 2015

First day in the nfl in the books. Great day but ready to get better. Lovin Tampa bay tho ?????

— Kenny Bell (@AFRO_THUNDER80) May 9, 2015