We've seen a few people post about how to track the 100 miles between June 20 to August 15 for the Pedal the Prairie challenge. You can do it via Love To Ride website or old school.
Love to Ride: allows you set a goal for a specific time range and distance. This can be done from from your account. Click on the Goals tab and set up the goal as shown below. Currently, there is not an option to do it in the group.
Old school: you can also go old school and simply keep track of your miles ridden on a form (paper or electronic). At the end you can email the form to Chad Shelton (cshelton@cityofsunprairie.com). Templates can be found on the Sun Prairie Park, Recreation, & Forestry event page or you can pick one up at the Westside community building.
