High Dose Participants randomized to this group will undergo a protocol consisting of 2 hours of sauna therapy per day, for a minimum of 5 days per week, completed in 3 weeks or less (21 days). (15 total sessions, 30 hours of sauna). Participants will be able to schedule visits on any of 7 days per week. Maximum flexibility in hours of operation as well as flexibility in which days are attended will be utilized to increase likelihood of retention. A participant may attend visits for 15 consecutive days, should they wish.