(Spirit Rock Meditation Center) There are two main forms of meditation as taught by the Buddha: Developing concentration and developing insight. We explore how they go together, the nature of concentration (samadhi), and the different ways of developing samadhi. We also look at some of the typical challenges of developing samadhi, particularly over-active minds, sleepiness and low energy, and over-efforting. Throughout there is an emphasis on finding ways to integrate active effort with ease and relaxation. The talk is followed by discussion.