Luke Miller M.S. CSCS TPI LEVEL 1 on Instagram: "If you finish a session wondering whether you even trained the muscle, the issue usually isn’t volume or programming… it’s execution. If the stimulus doesn’t land, progress never has a chance. Before changing your split or adding more sets, make sure your mechanics actually match how the muscle is supposed to work. That’s the foundation everything else sits on. If you want a simple guide on how to film your training and assess execution properly,