Joe Nathan has always been able to run well, which helps explain how the 37-year-old has been able to keep pace or even outpace Texas Rangers pitchers 10 to 15 years younger than him this spring. But there's also the notion that someone is only as old as he thinks he is, and, after an off-season without physical limitations, Nathan feels like he's just out of college. He has sipped from the Fountain of Youth almost two full years after having his right elbow rebuilt. The timing couldn't be better for the Rangers, who signed him in the off-season to replace Neftali Feliz as their closer.