Yeah. Apparently he did a few too many of his own stunts during his career.
Coincidentally yesterday I caught a few minutes of "Creed" on TV, the Rocky comeback movie. Stallone plays Burgess Meredith's part as the trainer, this time of Apollo Creed's son. The brutal and graphic fight scene was enough to make me switch channels.
But not before saying out loud, "Man, Stallone needs to retire." Action heroes don't last forever.