Fitness Events and Challenges

I am putting together a list of Fitness Events and Challenges available to USMS members. These could be virtual, postal, logs, or anything any club has come up with to motivate folks to swim more. If you know of any such event would you please post it on this thread. I promise to post a final list in a compact form if I get some responders. I already know about GTD, Postal 5K/10K, and the Hour Swim series. Thank you, Robin Walker