This thread belongs in the Lifestyle Category.I would go with a Whey Protein Powder and or Creatine.Be very careful while using these supplements.Make sure you drink plenty of water.The best thing for power and speed is to do plyometric excercises.They will get you into the type of shape needed to be a solid running back.Good luck to you.
if you pure clean protein go with"isopure" and also there is a company called Vitol they make a great egg protein. both of these are clean good proteins.