Ex-NFL Star -- Describes Heroic 90 MPH Chase ... After Police Hit & Run

You gotta watch this video ...

Ex-NFL star Akbar Gbaja-Biamila -- the host of "American Ninja Warrior" -- describes exactly what happened when he decided to get in his car and chase after an SUV that hit an LAPD motorcycle cop.

It's an incredible story ... before AGB gave chase during the June '15 incident, he blocked traffic so other cars wouldn't hit the downed officer ... an incredibly smart decision.

Once he felt the cop was safe, Akbar got in his car and raced after the suspect -- in a story that sounds like it was written for a Hollywood action film. It's incredible.

Akbar was hailed as a hero by the LAPD and was given a commendation for his actions earlier this week.

One more thing ... with Michael Strahan leaving 'Live' -- we asked Akbar if he's in the mix to take over the gig.

Akbar says it would be a "game changer" -- and makes his pitch for Strahan's seat.

Come on ABC, give a hero a shot!!