For a 13 year old boy that is 5'10" and 140 pounds what should be an average bench press weight for a 1 rep max.

A good 1RM for the bench press is 1.25 x "Body Weight" for men. For a 140 lbs male, 1RM is 1.25 x 140 = 175.
Updated on Monday, February 06 2012 at 07:24PM EST