Dolphins running back Ronnie Brown worked hard this offseason and feels as though he's now "more explosive." Concerns about Brown's weight and knees are things of the past. "As far as shape goes, he's outstanding right now," said Dolphins coach Tony Sparano. "That sounds like a company line, but I mean it. In the weight room the guy is super right now. He weighs 230 pounds, he's running better, he is stronger, so all of those things from a progress standpoint I see as positives." Brown believes that he deserves to be mentioned among the best running backs in football, and appears ready to prove that this season. "I think I'm more explosive," he added.