As far as I know using meditation to improve game was popularized by RSD. It plays nicely into their concept of getting into "state" while at a club. I didn't start meditating with the intention of it improving my game but I have noticed some benefits.

I've tried meditating a few different ways. One of them was just called "Vipassana". This practice involved being aware of your body and dismissing thoughts as they arose. I followed this practice with the aid of a teacher for around 6 months of approximately 20 minutes of meditation a day. I found it to be completely ineffective and quit.

Another type I tried was called Osho meditation. I learned this practice at a retreat setting over the course of a weekend. It was completely different from my previous meditation practice and involved jumping around like a maniac and screaming at the top of your lungs. I definitely felt a type of release after this practice and think there is some benefit to it. I only practiced this type once after leaving the retreat.

The most recent type I tried was also called Vipassana but it was taught differently. The instructions were much more specific and I was at a centre where I planned to stay for 5 days. The results I got from this practice were so significant that I ended up staying at the centre for 11 days and came back a few months later for another 13 days.

Some of the benefits include:

1) Awareness of mind. This is pretty awesome as you encounter a lot of roadblocks along the PUA journey. Since you are actually aware of the thoughts that are arising into your mind you can tell when you're just rationalizing some nonsense that is just keeping you in the same rut you were in before. With this skill you can take action instead of rationalizing your aversion.

2) Increased acuity. When you spend a lot of time focusing on your body and mind you can see more nuances than previously. This allows you to have more influence over them. For example a lot of normal behaviors become more "alpha" when they are performed in a slow and controlled manner. You can turn tour head slowly when someone calls your name, take pause when someone is waiting for a response and even blink slowly (I have heard this is one of the reasons we find cats so comforting).

3) Less neediness. From what I can tell the ultimate spiritual philosophy is that you already have what you're looking for inside of you. It's one thing to read this on a page, but it's a totally different experience when you practice meditation for extended periods of time and actually build a substantial reference experience for what this truly means.

4) Game recognition. Once you realize that you can experience true happiness from just sitting on a cushion in a room all by yourself, the fact that sexual competition is just a biologically wired evolutionary instinct becomes more apparent. You don't look to women for fulfillment anymore because you know they can't provide it. You just play the game because there is no other option and it is fun.

I am holding off on the meditation right now because my last experience really messed with my head. I'm still trying to contextualize it's effects and how I want them to fit into my lifestyle. I do plan to start again at least in the next few years however.