Calf muscles

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When I walk outside and do my walking DVD in the house my calf muscles get rock hard. They don't hurt, cramp or burn, but give a weird sensation instead. My potasium and sodium levels are ok and within range, so I know that isn't it. I do a warm up and cool down before I start and finish exercising. I'm not in good shape due to my health and breathing issues, but I'm working on increasing my capacities.

What I want know is:

1. Why this is happening?
2. What the fix is?

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