hey all, I'm sure this has been covered and I did a search, but I am curious how many of you use them? My brother says I should start. I hammered it pretty good today and I figure I was way over my threshold. I don't know much about the subject and am going to learn. He said to go out and just hammer the crap out of it doesn't get it at my age of 51. And are there any monitors I should look at, or they all about the same? Thanks.