doctor shelby terstriep says exercise for the average person is just as important. (sot: dr. shelby terstriep, oncologist) "a lot of it is keeping people at their ideal body weight because we know when people are more at their ideal body weight they have less of some dangerous hormones insulin and insulin-like growth factor." terstriep says exercise can also reduce the risk of cancer coming back. (sot: dr. shelby terstriep, oncologist) "it also helps to decrease inflammation in the body which we know that inflammation can be one of the drivers of cancer." though exercise and running is an important part of denise's routine, she says her prognosis has given her a whole new perspective. (sot: dr. shelby terstriep, oncologist) "i don't run for time anymore, i run for my life." >> that was danielle barber reporting. doctor terstriep recommends 150 minutes of moderate exercise or activity a week -- that's about 20 minutes per day. and, two days of strength training for all major muscle groups per week. it's . time for a break. we're back with our fourth half hour of news 4 today.