Some teams are insane about it. One team I knew had their top RBs carry a ball around for almost the entire practice. People punching at it constantly- coaches, trainers, players. If the ball came out everyone on the offense ran- even the coaches.
In indys, some have multiple tug and punch out drills, then when in skeleton they have boxing gloves on coaches, punching the ball. Then on air- same thing- fit and freeze more of the same. Even seen the entire D swarm on a ballcarrier during a team fit drill- and they are all trying to get at the ball.
Not all teams practice alike, with the same amount of reps, commitment, intensity. THATS why some coaches do better than others- they all aren't carbon copies of each other.