Why is a muscle I train not counted?

A muscle needs 3 sessions of its own before it counts toward your overall Strength Score. Until then it neither raises your score nor lowers it.

This is why one very heavy day cannot set your score. Kovo waits to see the muscle a few times before it lets that muscle speak for you.

The muscle can still show a score of its own before then. Having its own score and counting toward your overall one are two different marks, and the muscle reaches them at different times.

Keep training it and it joins the total on its own.

Learn more: Why does my Strength Score say locked?