Bullworker
Sign in to saveBullworker is a product and fitness company that specializes in isometric exercise, that is the static contraction of a muscle without any visible movement. The original portable home fitness device was invented by Gert F. Kölbel in 1962.
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Bullworker é uma máquina de exercício físico chamado exercício isométrico que foi inventada por Gert F. Kölbel em 1962.
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