If I'm not mistaken. "Grinders" are people who play cash poker as a sole means of income.

The definition of solid poker to me is knowing how the table is playing and adjusting your game accordingly. If you're on a tight table you can loosen up a bit because the odds of you making a huge pot are slim and none. And when there is action you are usually beat. So you take stabs when you can, and steal as much as you can until you're called or reraised. Then you fold and start all over again.

If you're on a wild table then you pull back a bit and wait for good hands. And play according to the tenets that are taught in FTR's strategy section. (I'm such a shameless whore ) Play your position and strengths. It's really a matter of getting as much playing experience as you can. I know playing online has made me a much better live player.