Heh, I remember.
I just don't understand how these bozos could pin chest and lats and expect anything but, well, big ugly lumps!
These are the secret techniques of high-level bodybuilding, and I'm not even joking.
To pin chest, you use 1" 25ga needles and do lots of small-volume injections, pushing the needle in all the way. Tiny tits physically cannot do this. Generally you go upper/outer chest.
To pin lats, you can use a longer and heavier needle. It's best to get help, but if you're solo, raise one arm over your head, and pin the lat on that side with your other arm. You can do 1.5cc this way. Then massage the muscle.
Chest injections are literally painless and harmless. It's one of the easiest spots, once you get over the mental block.
Lat injections are, for me, painful as hell!
These days I only do SubQ. But I understand why guys stepping onstage seek every advantage...