WinterBorn If someone wants to achieve results in physical strength, speed, something like CrossFit, boxing or Olympic weightlifting, physical work will greatly interfere with him, believe me, I have experience in this. His fatigue will not allow him to grow as an athlete. Even if he does something extraordinary at work, he does not have regularity and this will not help him much in sports.
Sport is very hard work, it requires strong mobilization and good recovery. Half an hour of intense training can kill your muscles for a week.