Resorts specializing in maintaining or improving the health or rejuvination of its clients, often including dietary and exercise instruction, bathing in mineral waters, breathing of fresh air, and formerly, extended exposure to sunshine (which was formerly considered healthy). Resorts specializing in maintaining or improving the health or rejuvination of its clients, often including dietary and exercise instruction, bathing in mineral waters, breathing of fresh air, and formerly, extended exposure to sunshine (which was formerly considered healthy).

Source: AAT

http://vocab.getty.edu/page/aat/300000553