Muscles are bundles of contractile fibers that are attached to bones by tendons. These bundles have different types of fibers within them, and horses have adapted over the years to produce different amounts of these fibers. Type II-b fibers are fast twitch fibers. These fibers allow muscles to contract quickly, resulting in a great deal of power and speed. Type I fibers are slow-twitch fibers. They allow muscles to work for longer periods of time resulting in greater endurance. Type II-a fibers are intermediate, representing a balance between the fast-twitch fibers and the slow-twitch fibers. They allow the muscles to generate both speed and endurance. Type I muscle fibers are adapted for aerobic exercise and rely on the presence of oxygen. Type II muscles are needed for anaerobic exercise because they can function in the absence of oxygen. Thoroughbreds possess more type II-a muscle fibers than Quarter Horses or Arabians. This type of fiber allows them to propel themselves forward at great speeds and maintain it for an extended distance.[28]
Benter was struck by the similarities between Kelly’s hypothetical tip wire and his own prediction-generating software. They amounted to the same thing: a private system of odds that was slightly more accurate than the public odds. To simplify, imagine that the gambling public can bet on a given horse at a payout of 4 to 1. Benter’s model might show that the horse is more likely to win than those odds suggest—say, a chance of one in three. That means Benter can put less at risk and get the same return; a seemingly small edge can turn into a big profit. And the impact of bad luck can be diminished by betting thousands and thousands of times. Kelly’s equations, applied to the scale of betting made possible by computer modeling, seemed to guarantee success.
When a bookie sets odds for games, he will build what bookies call an “over round” into his set of odds. Another slang term used for this formula is “the juice.” For the sake of simplicity, let’s look at a boxing match where both contenders are equally talented, of equal stature, etc. Since they both have an equal chance of winning, a casual bet may be even money. You put $20 on one guy; your friend puts $20 on the other. Whichever fighter wins awards the bettor with the total of $40.

The easiest way to demonstrate the math behind a sports bet is to make up an example. Let’s say you and your buddy walk into a casino, each with $200 burning a hole in your pocket. There’s a big game on tonight, the Cowboys and the Redskins, so you wander into the sportsbook to check up on the latest news about the game. While you’re sitting there, you see the wagering board, with some funny numbers on it. It looks like this:
Historically, equestrians honed their skills through games and races. Equestrian sports provided entertainment for crowds and displayed the excellent horsemanship needed in battle. Horse racing of all types evolved from impromptu competitions between riders or drivers. The various forms of competition, requiring demanding and specialized skills from both horse and rider, resulted in the systematic development of specialized breeds and equipment for each sport. The popularity of equestrian sports through the centuries has resulted in the preservation of skills that would otherwise have disappeared after horses stopped being used in combat.[8]