 Get matched at Mattress Firm. Sleep at night. Restrictions apply. See store or website for details. Athlos Academy of St. Cloud. I'm sure you've seen the building. It's beautiful with large grand columns in the front on the south side of St. Cloud. Athlos is a free, yes free, kindergarten through 8th grade public charter school that prepares students for lifelong success by focusing on academics as well as health and character.