A golf swing training system and method includes a golf club, a light connected to or incorporated in the golf club, and a graphical display upon which a light is projected when a golfer swings the club. Also disclosed are pharmaceutical compositions containing such compounds and methods for their use as therapeutic agents. It has wheels and a brake system for positioning the dolly beneath an attic entry. In one or more embodiments, supervisors may automatically recover failed modules in a distributed system by moving the modules and their dependencies to other nodes in the system. The extraction yield is maintained between 15 and 30% and the coffee extract of 25 or 40 grams is delivered in a flow time of 20 seconds or less. The micro-controller switches voltage signals input from the analog front-end to determine failure of the analog front-end or the micro-controller.