dr. nailer specializes in that at va hospital. >> when you have something terrible and you are haunted by it. >> research indicates exercise may be out of it it's like aelly roll here. >> this experiment explores possibilities of exercise as a cure. research is so promising, john mayer adopted it today. he's given time, and notice, and money almost reluctant to be interviewed. >> i think if you have' voice it's a duty to have the knowledge sou don't derail whatever sit you're talking about. >> now, back to the experiment. no drugs just effort hoping to sweat away what might have seemed intangible. >> i thought it's a mess. and i realized it's the real thing. >> from presidio wayne freedman abc 7 news. >> let's head outside now. >> jand patel is here with the weekend forecast. >> tonight the fire danger going up in north bay hills. we have more trordz pass along. looking towards san francisco, sutro tower, sunny skies there. here are the records. napa, 92. san francisco, p 79. oakland 86. mountain view, 88, new records. so another day of record heat. we do vai red flag warning until 3:00 p