Those of us who watch the Olympics as bystanders tend to smugly judge athletes for succumbing to pressure without understanding what we even mean by the term. The first thing to know about pressure is that it has actual physical properties. Feeling it is not a sign of a too-thin veneer of character. Pressure might as well be a snakebite, given its very real qualities in the bloodstream and how it can paralyze even the strongest legs. The way to deal with pressure, and become an Olympic great,