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ive been running for several years now, im 54 ive done 4 half marathons all around 1 hour 57 ,but the last one i locked up with severe leg and arm cramp together it went away when i walked but as soon as i started running it came back it happened around six miles in first time but now in training. it always comes on.i feel fine ,i always drink plenty of water . eat bananas, take multi vitamins. someone said it might be claudication, narrowing of my artieries,lack of oxygen,anyone got a clue..