tonight, obama ra winfrey welcomes the rosie show to her network. >> i knew she had the goods. >> one of the sharpest tongues tells us what it's like to be back. >> i passed it. i'm not sure how but i did. >> and weighing in. president george w bush sits down with bob woodruff. what he thinks on the war on terror now. >>> good evening. we begin with children's health. childhood obesity gets the lion's share of the headlines. tonight, we take a look in the opposite direction. starting with a fitness guru with six pack abs. his name is c.j. senter, and his body is amazing. is there a thing as too much. >> reporter: who other than justin bieber gets this kind of welcome? he is a pint sized celebrity training. just 10 years olds, c.j. has motivated the 4r50 kids in elementary school to get on his feet. this is how he trained them. >> now up jump, and then repeat. >> it's hard. >> it is. >> c.j. senter is the workout kid whose videos plan to help get them in shape like him. that is an eight pack. there are few adults who want him to have an six pack. he puts me to shame. how many do we hav