If you have a place on your body, that feels under-developed, or seems painful, or what-have-you, a good exercise is to find & locate that exact [muscle] & give it a good, slow, long, effective stretch, targeting it, & feeling out its parameters.
Very good, that’s the point to focus on, & grow, & exercise. Visualize as bigger/the way you intend it to be, & get it there, even if the way is just you in front of a mirror, whatever it takes, if that’s your goal, or just accept it as-is, as you, as the way you are [so far] & see what happens. 😂
The lord is going to take care of you, always, giving you grace as/when you ask for it/need it, & more if you ask more/connect, & praise & serve willingly [then life becomes plentiful]; I’m talking God. 🙌