<s>[INST] I am 32, cycle 150 miles a week, eat healthy dont have any long term health issues. When I do nothing for a day or 2 and start to do exercise again I get cramping dead legs in my thighs. Stretching my hamstring relieves it but does not get rid of it. Could it just be a imbalance or something else? The more I sit around the worse it gets? [/INST] Hi, This occurs because of excessive loss of electrolytes from your body. All you need to do is to increase your water and electrolytes intake while you are exercising. This is normal phenomenon. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Rohan Shanker Tiwari, Orthopedic Surgeon </s>