This is the pay per week option! Payments are to be made on Sundays (the first week can be whenever you come to your first class)
 
It's too late to join the challenge, but the unlimited weekly pass is now available for everyone until the challenge is over!  The last week for this is March 30th-April 5th
 
You'll have to wait to join the next challenge starting after Easter to earn your 5 class pass...just by showing up!