What is taichi chuan? We sometimes read publications that claim to clarify what taichi chuan is or is not. If there were a single definition of what this discipline is, it would be a great help to the teachers who promote it to the public. The many...
Buoyancy A person's buoyancy index is not proportional to his or her weight, and other additional parameters need to be taken into account. For simplicity's sake, we'll start with a person without a surfboard. A 90 kg person, for example, will...
A job, a hobby, a pastime, a profession, a passion? Between those who declare that surf instructors are cool, town councils who tap surf schools in the wallet in exchange for the right to work on the beach, and students who ask you why you don't...