They do, indeed, thanks in part to the man known as RG3, who set a rookie QB record by running for 815 yards, and to another rookie, Alfred Morris, who finished second in the league with 1,613 yards rushing. Washington averaged an NFLhigh 169.3 yards on the ground, and its opponent in the first round of the NFC playoffs Sunday is the Seattle Seahawks, who ranked No. 3 at 161.2, led by Marshawn Lynch..Theories abound, but a growing body of research shows that exercise can stimulate the dopamine reward system in the brain much like drugs of abuse. While most of us could use more exercise in our lives, elite athletes may develop a compulsive preoccupation with training that resembles addiction. And triathletes in Hong Kong, found more than half had compulsiveexercise tendencies.

AVOIDING DISTRACTIONS: Belichick addressed the arrest of former Patriot Aaron Hernandez on a murder charge the day before training camp and players went about their business with an apparent minimum o