Before doing a quad shot, take your index finger and press firmly on your outer quad. You can locate areas that are less dense with nerves/veins by doing this. Once you find a good "dead" spot, stick that sucker (23g 1") in there good, quick & straight. If you're using an oil based AS, take up to 60 sec to complete the injection. Rub for a few minutes afterwards, & then go for a run or something.