Vipassana, which is a Theravada Buddhist tradition, via a 10-day intensive retreat. It's a remarkable practice for it's minimalism: there is no chanting, mantra, no imagination or visualization, no controlled breathing, etc. You are asked to observe the body and the breath "as it is". In so doing, you will experience various discomforts, which you learn to use to defeat the enemy of aversion, and pleasures, with which you learn to defeat the enemy of craving.

They ask students to practice 2 hours per day. I rarely do two hours, but find one hour in the evening to work. I also still drink alcohol on occasion, which means I will never qualify for the 20-day retreat. C'est la vie.

Check it out at http://dhamma.org