The study at the Max Planck Institute consisted of over 200 experiments over a ten-year period. Furthermore, it is said that he concluded that muscle growth can be attained by exerting 60% of existing muscle strength against a superior resistance for only seven seconds once a day, a fitness technique known as isometrics. If the contraction of a muscle exceeds one third of its maximum strength, its mass grows and hence also its strength". Erich Albert Müller and Theodor Hettinger "observed that contractions involving less than about one third of maximum strength do not train the muscle. A minor object is to provide locking means for transport or storage of the device, and other objects will become apparent, more especially in relation to economical and convenient constructional features". Again, an object is to provide simple means Whereby the adjustment at the time being may readily be observed. A further object is to provide such an exerciser with a degree of adjustability so that as the user's physique improves the effort he has to exert may be increased. An object of the invention is to provide an exerciser usable by compression between the hands or parts of the body or limbs. "The invention relates to physical exercisers for human use, and seeks to provide in a single device means whereby a large variety of beneficial exercises for the body and limbs may be carried out. Arthur William Chapman Ī second device, invented in 1937 by Arthur William Chapman would be used to create the Bullworker.
BULLWORKER INSTRUCTIONS PORTABLE
The objects of the invention are to devise a portable exercising apparatus particularly for the development of the chest and arm muscles, suitable for both old and young persons by reason of the interchangeability of the resilient member and generally to provide an exercising apparatus to be operated by the hands and arms, simple in construction, cheap to manufacture, durable and interchangeable as to its parts". "The invention consists essentially in the novel construction and arrangement of parts whereby spring controlled telescopic members are embodied in an exercising apparatus in a special manner more particularly described hereinafter. It consisted of three sleeved, spring-loaded, telescopic cylinders in the center, with two hand grips affixed at the outermost ends. The device looked quite like the first bullworker to come (without strings). The original device was patented in 1912 by an American Citizen from Brooklyn, Arthur A.
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