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Defnyddio gwrthiant ar gyfangiad cyhyrol er mwyn cynyddu cryfer corfforol, dygnwch anaerobig a hypertrofedd cyhyrol cyhyrau ysgerbydol ydy hyfforddi cryfder. Ceir nifer o ddulliau gwahanol o hyfforddi cryfder ond yr un mwyaf cyffredin ydy defnyddio disgyrchiant neu hyfforddi gwydnwch er mwyn gwrthwynebu cyfangiad cyhyrol.
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