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"Stopping a six-pound ball with steam back of it, returning it with similar steam, is not pink-tea stuff," DuPuy wrote. "Dr. Boone estimates that as much beneficial exercise is obtained from half an hour of it (Hoover-ball) as from three times as much tennis or six times as much golf."

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When you discover a damaged wheel hub assembly, make sure it’s replaced with either OEM parts from your manufacturer or quality aftermarket replacement parts like WJB’s that meet the same standards. Making sure your vehicle is running on healthy wheel hub assemblies is a vital part of keeping your vehicles – and you – safe on the road.

"At seven o'clock sharp they choose partners and begin," Irwin wrote. "A factory down by the Potomac blows a loud whistle at seven-thirty. This is the signal to quit, no matter how close the score; for the business of governing must go on."

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The sport was without a name until New York Times Magazine reporter William Atherton DuPuy christened the game "Hoover-ball" for his 1931 article "At the White House at 7 a.m."

"It required less skill than tennis, was faster and more vigorous, and therefore gave more exercise in a short time," Hoover wrote in his memoirs.

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There are a lot of different signs you may run into during day-to-day driving that can indicate a problem with one or more hub assembly on your car. Grinding, roaring, knocking, or popping sounds from your wheels can indicate a bad bearing. These can be constant or only noticeable when you turn; they’re usually not audible unless you’re moving faster than 30 MPH.

Fortunately, a damaged hub assembly is easy to spot once you have your wheels jacked up off the ground. If at all possible, check your wheels two at a time – either both front wheels or both back ones. You can often spot a broken wheel bearing simply by comparing the behavior of two wheels after you spin them at the same time. If one of them shudders, slows down, or grinds to a stop before the other, it likely has a bad bearing.

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"Getting daily exercise to keep physically fit is always a problem for Presidents," Hoover wrote. "Once the day's work starts there is little chance to walk, to ride or to take part in a game. Taking walks or rides early in the morning is a lonesome business, and the inevitable secret service guard when the president leaves the White House grounds is not enlivening company."

Hoover-ball is a combination of tennis, volleyball, and medicine ball. White House physician Adm. Joel T. Boone invented the game to keep President Hoover physically fit.

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On those rare occasions when they were forced inside, the Medicine Ball Cabinet retreated to the White House basement to play the game.

In the longer term, you need to check your wheel hub assemblies if you notice uneven or abnormal wear on your tires or brake components (rotors, pads, and discs). If you let a professional mechanic handle your tire rotations and brake maintenance, they should perform routine hub assembly checks while they do these tasks. If you like to handle your own maintenance, though, it’s especially important to make sure your bearings are in good working condition.

The sport originated in 1928, when shortly after his election Hoover took a goodwill trip to South America. While aboard the battleship Utah on his return, he watched a game of bull-in-the-ring, a medicine-ball game that was popular on naval ships. A soft nine-pound medicine ball was thrown from one to another of the players standing in a circle as the "bull" in the center tried to intercept it. During the trip, the President-elect played and enjoyed the game, which was the inspiration for Hoover-ball.

Damaged wheel hub assemblies may fail catastrophically, causing you to lose control of your vehicle. This is a worst case scenario and few people suffer through it. A damaged assembly still impedes the proper functioning of your car, though! It can increase the wear and tear on other vital components including your brakes and tires. By reducing those parts’ effectiveness, a damaged wheel bearing can compromise your safety while you’re on the road.

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"It is more strenuous than either boxing, wrestling or football," wrote Will Irwin, a friend of Hoover's, in a 1931 article "The President Watches His Waistline" in Physical Culture magazine. "It has the virtue of getting at nearly every muscle in the body."

Hoover and Dr. Boone then hit upon the idea of morning medicine ball workouts. Dr. Boone adapted bull-in-the-ring to Hoover-ball to help the President slim down. Four days after Hoover's inauguration, the games began. The players experimented with medicine balls of different weights (the nine-pound used for bull-in-the-ring was too heavy) and with the net at different heights before finalizing the Hoover-ball rules.

Although modern wheel hub assemblies (also known as wheel bearings) are designed to last as long as your car, they’re subjected to such tremendous strain that hub damage is fairly common. Most drivers will have to deal with a damaged hub assembly at some point in their vehicle’s lifetime.

"Except for Sundays, we played medicine ball every morning of the week, including official holidays," Secretary of the Interior Ray Lyman Wilbur wrote in his memoirs. "Only absence from Washington kept us away."

Hoover-ball was played by teams of two to four players with a six-pound medicine ball over a net eight feet high on a court similar to one used for tennis. The game was scored exactly like tennis, and played in a similar fashion. The server throws the ball. The opponent must catch it on the fly and immediately return it, attempting to put it where it cannot be reached and returned. The side that misses the ball or throws it out of bounds loses the point.

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Some people said, a car is a collection of thousands of carefully-designed parts that are needed their attention to maintain with. When it comes to your wheel hub assemblies, you definitely need to muster your patience and go the extra mile to make sure they’re in good working condition; these components are vital in keeping your car safe and efficient.

"We paid no attention to the weather except for a very heavy rain," Wilbur recalled. We played in cold and wind, snow and rain, and in the four years we were driven indoors only two or three times, because of an unusually drenching downpour."

Early each morning, between 4 and 18 VIPs would show up for the games on the south lawn of the White House. The participants soon became known as the Medicine Ball Cabinet, although not all were official Cabinet members.

To check individual wheel hub assemblies, you need to look for “play”. “Play” is any looseness in the wheel’s connection to the axle when it’s fully bolted down. You can check for play by grasping the wheel at its top and bottom, and pushing one side while pulling the other. You shouldn’t be able to wiggle the wheel to any significant degree this way; if you can, then the wheel has a dangerous amount of play.