Ana Pana Sati is the simplest Meditation

"Even though there are thousands of meditation practices, the practice of Anapanasati is the simplest of them all. Ana in Pali means in-breath; apana is out-breath and sati means 'to be one with'. Hence, Anapanasati means to be one with the breath. This meditation was originally taught by Buddha; in recent times, it has been popularized by Brahmarishi Subhash Patriji."