People can join in at any point. Even people in places where it's winter right now.

Any type of goal is okay (doesn't have to be weight).
Weigh-ins are weekly, but can be whatever day of the week works best for you.
Template to use if you want:
Goal:
June 26-July 2:
July 3-9:
July 10-16:
July 17-23:
July 24-30:
July 31-August 6:
August 7-13:
August 14-20:
August 21-27:
August 28-September 3
September 4-10:
September 11-17:
September 18-24:
September 25-October 1:



)
next to the weekly weigh in when I achieve that goal. I decided my weigh in day is on Wednesdays.