Yeah, you can inject in these bodyparts
Glutes{butt}
Triceps
biceps{I do not recommend this as it hurts like hell}
Thighs{my personal fav}
Hamstrings{goes in very smoothly}
calves{Again I do not recommend this if you enjoy walking}
Aspirate{pull the plunger back} EVERY time...Don't want to inject into a vein...It won't kill you but the shortness of breath is no fun...