re: First injection of testosterone: what to expect?

I finally convinced my GP to include testosterone in my annual physical bloodwork a couple of years ago. It was slightly less than the low end of the range for my age. I didn’t do anything about it because I felt like my body felt as good as my 20’s.

I got it checked a few months ago and was barely in the normal range (maybe 252?). I’m in my 40s and still feeling great, weights & basketball good as ever, little fella doing great, usually sleep well, plenty of energy.

Soft tissue injuries such as calf strains are more common now but I try to manage it. Would higher test have any impact on that? Or any other benefits besides gainz (which I don’t think is a big goal anyway)?