The football legend was at Pier 39 Thursday morning with Gillette Odor Shield to unveil a free pop-up fitness site at the pier.
It's called "My City Is My Gym" and Rice hopes it helps people see how to use their urban surroundings for an outdoor workout.
Rice says it's easy to break a sweat using nothing but a park bench, vending machine, or even scaffolding.
The event will run through Saturday.
