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Hey Thar, You are bang on about the Magnesium. NZ diet is often low in magnesium and its the building block in the chemical reaction that allow our muscles to contract and return to extension- which...

Theres a natural spray called cramp stop which is the business - saved my arse in more that a few Ironmans especially in warmer climates.

Always in my daypack as are the pain killers if my back...