Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
The baseball playoffs start Friday with wild card games in the National and American leagues. In the AL, the Baltimore Orioles play the Texas Rangers.
In the NL, the defending World Series champion St. Louis Cardinals play the Atlanta Braves.
The one-game winners will move onto the next round of the playoffs against the divisional champions in each league: the New York Yankees, Oakland A’s and Detroit Tigers in the AL and the Cincinnati Reds, San Francisco Giants and Washington Nationals in the NL.