Aaron Rodgers' surgically repaired Achilles is already looking game ready ... as it seemed to hold up extremely well during a grueling workout in Santa Monica over the weekend.
The New York Jets quarterback hit up a popular staircase in the city on Friday afternoon with a couple members of the USC football team ... and he sure looked like a guy who had two healthy legs underneath him.
The 40-year-old went up and down the stairs over and over again -- with pace every time -- and the exercise was such a grind, it actually seemed he was on the verge of upchucking.