Arnold Schwarzenegger’s flexed bicep was said to be 22 inches in circumference; Mike Tyson’s -- 18.5 inches; and Venus Williams’s, 15 inches. That’s a lot of muscle. But chances are your arms are that big, too. Because more than 70 percent of adults are overweight or obese, a majority of folks have biceps (unflexed) that are between 13 inches to more than 17 inches in circumference.
That makes gett…