Tensing when masturbating

I read an article recently that I might be actually masturbating wrong!!? 27/m here and as far back as I can remember I have been squeezing my kegel muscles while masturbating and during sex. It makes me feel harder and also makes me “feel more” during sex with my gf. Now I read an article that says that you should be relaxed?? But wouldn’t that mean I’m not as hard? And less feeling? Should I be practicing without tensing! Any advice would be great