This is part of a series of challenges to keep you motivated throughout the year. During the spring quarter you must run a minimum of 100 miles, but you can run any distance. You will receive a fantastic medal, which is a great stand alone medal or will fit together with the other three seasons to complete the larger "Four Seasons" medal. You can also receive one of our fantastic distance T-Shirts or a plain Saturn T-Shirt at a discounted price if you sign up for all Four Seasons. Select your mileage T-Shirt now in order to really give you a great incentive to achieve your challenge and keep you motivated. If you are interested in completing all Four Seasons, the cheapest option is to buy the series up front. This will give you access to all Four Seasons. You can join this challenge at any time of the year, even part way through a season. If you don't make the minimum distance in the remaining part of a season, you still have the start of that season when it comes back round! For simplicity, we have kept the seasons as follows: Winter: January, February and March Spring: April, May and June Summer: July, August and September Autumn: October, November and December