Yeah, I was being careful about using too much back. I find that if I brace my abs when I throw the right muscles end up doing the work. My glutes are absolutely trashed right now.
And yeah, I will do a higher volume of throws later, but my back was already tight from studying and making the medicine ball immediately prior to training, so I didn’t want to overdo it.
The weight will have to stay. 23 lbs may be a bit much, but the ball is sealed up. In any case, it’s lighter than PCs or snatches.