The term ‘spot injection’ refers to an injection directly into the muscle that you hope to improve with AAS. Long acting AAS (. Nandrolone Decanoate (Deca), Testosterone Propionate, Testosterone Enanthate, etc.) are designed to break down gradually over time by passing through the liver. Once broken down and in a ‘usable’ state the blood system carries the AAS around the body and into the muscles. So the likelihood is that spot injections with most long acting steriods is pointless except perhaps to reduce scar tissue in one area. That said some claim to have had great results by spot injecting and stand by the method. Spot injections with the likes of Testosterone suspension are more likely to be effective as Testosterone suspension does not need to be broken down by the liver and is in a ‘usable’ state on entering the body.