Daniel Craig didn't get his famously fit body by sitting around on his behind.

The "James Bond" star amped up his studly physique with a 9:30 a.m. workout at DavidBartonGym earlier this week, alternating between sprinting and jogging on the treadmill, a fellow gymgoer told us.

According to the spy, Craig, 46, kept a "low profile" at the Astor Place gym, wearing black workout gear with a low-slung baseball cap and large headphones.