SPONSORED by Pfizer | Collapsed Athlete, Damar Hamlin won’t say if his Doctor is Sponsored by Pfizer

Buffalo Bills player Damar Hamlin is opening up about his sudden collapse during a football game and his remarkable recovery.

During an interview with Michael Strahan on "Good Morning America," the 24-year-old Bills safety said he feels grateful to be alive.

"That just kinda put things in perspective for me, you know, hearing it from the doctor," Hamlin said. "Things could have went differently and the details of the situation of everything that happened on the field -- it could have been -- it could have been the last of me."

Hamlin said he remembers preparing for that Monday night game six weeks ago against the Cincinnati Bengals, one of the last of the NFL season. He said he was feeling great.

"I remember the things that we were focused on going into the game," Hamlin told Strahan. "Just trying to get a win."

But with 5:58 left to go in the 1st quarter -- after making a tackle -- Hamlin stood up and then suddenly collapsed, going into cardiac arrest.

Denny Kellington, the assistant athletic trainer for the Bills, immediately began performing cardiopulmonary resuscitation, or CPR, on Hamlin.

If CPR is performed on a patient immediately, it can double or triple the odds of survival, according to the American Heart Association.

Emergency personnel also used automated external defibrillator, or an AED, a medical device that analyzes the heart's rhythm and will deliver an electrical shock if needed.

Strahan noted that Kellington is the one who alerted everyone on the sidelines that Hamlin's medical condition was serious.

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