The best advice I received when I first started scrolling were two simple things:
Relax, drop your shoulders down. I did realize until I read that that I was so tense when scrolling I had my shoulders up around my ears!
Breath normal, which also means relax.. I realized I was holding my breath do to being tense.
Paid attention to these to things and I really started enjoying scrolling.
Not a good application for spiral blades. They do not give as clean a cut as a straight blade, but in my book they certainly have their place. I use them often for some applications.
Les, I do not know that it has anything to do with pop-up. I think I spoke out of turn, thinking ads not pop-ups. I am conscious of Ad Blockers because of this thread: