Manual Labor: Harder than it looks

Now, I mentioned before that I have a manual flooring nailer. I thought about a pneumatic (air compressor) one, but I bought a manual one for several reasons.When I had done flooring in the past when I was younger, I used a manual one like this. They really didn't have a lot of air-powered tools around 'till recently. So I was more comfortable with it. I didn't want to buy a compressor just to