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My wife has rigidity or cramps occasionally. We purchased rubber ice bags from the pharmacy.These are not recommended for hot applications but I fill it with hot water as hot as comfortable. Placing it at the back of the neck releves the problem. I also use the same technique by placing the bag under the back of the knee that is shaking to help stop tremors when she is off. You will be very pleased with how this works and how you can literally switch off the problem. The bags are also great to bring with you in a car if you are taking her someplace and she begins to be uncomfortable.