Like suspenseful films or interrogations of suspected deodorant thieves, saunas exist to make people sweat. Prove you're not wearing ill-gotten antiperspirants with today's Groupon to Smooth Aesthetics Medical Spa in Burbank. Choose from the following options: For $30, you get 1 45-minute infrared-sauna session (a $75 value). For $125, you get 5 45-minute infrared-sauna sessions (a $375 value). For $199, you get 10 45-minute infrared-sauna sessions (a $750 value). At Smooth Aesthetics Medical Spa, clients slip on soft terry-cloth robes and recline in their own personal saunas, where they drift off into music as they absorb infrared heat. The heat stimulates the circulatory and lymphatic systems and induces a deep, healthy sweat, which flushes away environmental toxins and repels wicked witches. Perspiration also rids the body of excess water weight, and increased lymphatic activity shuffles away stray fat cells. Infrared heat can also uncoil muscle knots and neutralize symptoms of arthritis, overexertion, and fibromyalgia. After their sessions, clients can shower to bring their body temperatures back to normal before plunging back into the wider world the way a salmon plunges into its graduate-school dissertation.