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The kettlebell or girya ((ロシア語:ги́ря)) is a cast-iron or cast steel weight (resembling a cannonball with a handle) used to perform ballistic exercises that combine cardiovascular, strength and flexibility training.〔 〕 They are also the primary equipment used in the weight lifting sport of ''girevoy sport''. Russian kettlebells are traditionally measured in weight by pood, which (rounded to metric units) is defined as .〔 〕〔 ==History== Kettlebells were developed in Russia in the 1700s, primarily for weighing crops. It is said that these farmers became stronger and found them useful for showing off their strength during festivals. The Soviet army used them as part of their physical training and conditioning programs in the 20th century. They had been used for competition and sports throughout Russia and Europe since the 1940s. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「kettlebell」の詳細全文を読む スポンサード リンク
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