I stopped glute injections bc I couldn't turn around to see what I was doing without straining myself. The quad allowed me to see everything I'm doing and use both hands freely. Those are the reasons why I like quads. Delt for me would be a little tough, especially aspirating bc you aren't using two hands. Maybe I'll go calves when I need a new spot but quads have been a god send since I started them. Plus the quad is so big, you have a large muscle to pick a spot and not get too much acar tissue in one spot. Only issue I had was that I left the band aid on during my chest workout. While I was laying down with the dbs, my short leg rode up some and I wasn't sure if people could see the band aid which would be a dead giveaway that I'm using. And since I had two dbs in my hand, I couldn't just pull it down to cover the band aid so I rushed the set lol.