pre contest id put them anywhere that didnt hurt, ed shots knock the fuck out of you after a few weeks,,,,
rear delts is a great shot also, triceps ( if there meaty )... could never get away with quad shots, felt like youve been stabbed, end up limping all week, still used to do them from time to time when everything else was too sore
best tip for sight injections is to shoot that muscle after youve trained it, as it may be too sore to use next day or two...