To my mind, the term "neckstrap" has got people in trouble because it suggests that the camera shouldbe worn around the neck like a medallion; the most painful is when you lean down it swings away, and when you stand up again it hits you right in the gut!
For years I have worked out a way to carry my camera with reasonable safety:
First make the strap a little longer than usual; then wear it around your neck, then pass your right arm through the loop, something like am schoolboy's satchel. Now, raise the camera to the eye as if taking a picture, but reduce the length of the strap loop so that it forms a slightly taut loop all the way round, which I find a help in improving steadiness.
When worn under a jacket, it is very inconspicious and the camera well protected, as it sits off to the right side of the body. And of course, no more getting hit in the gut.