I get back spasms... It is a day-to-day thing... But, in my opinion, the Astros would be wise to have Oswalt skip one start, and work back slowly... Not just sit around, but throw in the pen on successive days or something to test it out. He could throw Monday on pain killers/muscle relaxers, but it's not a wise thing. It's a marathon, not a sprint. Something tells me a back can get weak by working on a hamstring hard. One might have had something to do with the other.