Starting today, Nelly will be filling in for radio personality Staci Static on Hot 104.1 in St. Louis. The jock vacated her 3 p.m.-7 p.m. slot while on maternity leave. According to the station, the gig will last for a month. In related news, Nelly’s also working on a fitness DVD. Last night, he posted a couple of flicks of him getting it in the gym.