I stumbled upon this idea several years ago. I would stop by places without my darts, grab a beer, then pick up 5 or 6 bar darts and then toss them a bit, just for something to do. It was fun, especially when I hit good groups. I have been warming up and practicing with 6 darts in hand (my own darts, not bar darts) for the last month or so. I don't play near as much as I used to, so I decided to try this out. It definitely warms up the arm a lot faster. I can see my groups and tendencies much clearer. When I miss, I see the miss pattern. The patterns can be quite beautiful. Crappy darts, but beautiful miss patterns. I think this makes it much easier for me to make an adjustment with darts in hand, or with the next throw. A bad group is ugly, while a good group is darn impressive looking. One real positive I have noticed is that my third dart feels smoother, since it is not last, but rather just the next one. If you know what I mean. Six darts in hand is actually quite fun and makes practice much more interesting. You can do fun things like go D16, D8, D4, D2, D1, B. I started thinking about the arguments for and against 6 darts in hand and I think 6 makes sense for practicing your stroke. One final thought. It's much more satisfying to use 6 darts in hand on a real board, not electronic.