Agreed! I suggest letting people complete the workouts, even if they wouldn't be eligible to get the patch. Maybe with a message like, "The challenge is now over but..." These are well structured, progressive micro-workouts, in the vein of "Couch to 5K" (thanks, Aaron!!). For many, it's enough to complete the sequence of workouts and feel proud in their progress. People also can get a sense community from knowing there are thousands of others that have done the same workout. Additionally, there may be those that get a Playground part way through a challenge (as happened to me during spring) with no way to complete in time but with enough enthusiasm to start anyway!