You should be able to hit to an certain extent. I went through spring training this past spring and the most we were allowed to do drill wise was a grudge match type thing were you drive the person head up on you the opposite way. But these NFL players do need a break to rest their bodies or they are not gonna last as long as they could. They just need resonable boundries that both officals and coaches can agree on.
Texan By Birth, Aggie by the Grace of God