The three most common are: Deltoid, Vastus lateralis, and Ventrogluteal. There is also the Gluteus medius, but this is usually discouraged for risk of hitting the sciatic nerve
deltoid, gluteal maximus & gluteal medius.
Upper outer quad of either buttock (NOT in the middle-sciatic nerve route),top of arm-deltoid, and upper surface of thigh ie. either quad
Deltoid, Vastus lateralis and the gluteus medius.
Deltoid Muscle (Upper Arm) Vastus Lateralis Muscle (Thighs) Dorsogluteal Muscle (Back Muscle)
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