Above: PGIA SAR-rest-and-recovery. Sarsential 7: training off, sauna on [ skipp training, rest and recover ]. 

More on elevating core body temperature, sauna-benefits and more: Dr. Rhonda Patrick interviewed on Barbell Shrugged's podcast 'Biomedical Research, Nutrition, and Supplements w/ Dr. Rhonda Patrick - EPISODE 119' http://www.youtube.com/watch?v=BWa4aJE8YpU&autoplay=1

More (and more): http://www.foundmyfitness.com/

More about regularly scheduled off days and active recovery days : http://sealfit.com/blog/marks-blog-a-big-problem/