This term is new to me this year.  My son pursued football as an  freshman at a D3 school this year.  I understand that the last year for redshirting was 2003.  Greyshirting is similar insofar as it saves a year of eligibility, but differs in that the player does not practice with the team.  In fact, he is separated from the team and certainly not on the active roster.  He goes to the weight room, takes a football class to learn the system better, and keeps in touch with the coaching staff.  They had as many as 150 players show up first day, and after the usual attrition they still have about 20 young men greyshirting in order to comply with the NCAA 100 man roster limit.  Is this an acceptable and common practice?