Normal ClubHub operation has members staying in grades (categories) for the club's season, but for gyms this causes problems.
For example the gym's year might be 1 January to 31 December 2015, and Fred joins on 15 January 2015 and is put into category Boys 5 since his age is assessed on 1 January 2015, and is a member of that category until 1 January 2016. However Fred turns 6 on 28 January so he is really in the wrong category for 11 months.
We have optional functionality to
"...would be lost without it..."