Little Ember Co runs two wood-fired mobile saunas on the shore of Cedar Lake at Cedar Lake Point Beach in Minneapolis. From November to March, Thursday to Sunday, guests book a community seat for a 75-minute session of sauna rounds broken up by winter air, snow angels, icy water over the head or a dip in the lake. A single seat costs $35 for guests 18 and over, and both saunas can be rented privately for $299 for up to 10 people; workshops, birthdays and seasonal events are also hosted.