Don Benjamin & Sam Jones III Shirts Off ... Bro Workout On

10/16/2016 10:09 AM PDT
EXCLUSIVE

Former "America's Next Top Model" contestant Don Benjamin and "Smallville" actor Sam Jones III got their cardio in and stretched out together ... because fitness friendships are for life.

The pals got sweaty running around Fryman Canyon outside L.A., and put on their best abs and pecs show in the process. 

The pics say it all ... these bros REALLY enjoy staying in shape.