The feeling of tight and stiff calf muscles is usually due to strenuous exercise, resulting in more lactic acid and inflammation in the local muscle tissue, these metabolites will stimulate the muscle tissue, resulting in muscle tension, and often combined with the case of cold, because the cold will lead to blood circulation will slow down, and temperature stimulation will also lead to muscle tension and contraction, after the blood circulation is slowed down After the blood circulation is slowed, inflammatory metabolites and lactic acid will further accumulate, which will further stimulate the calf muscles and cause them to become tighter and stiffer. After this situation, you can perform ankle and knee flexion and extension exercises to relax the muscles and increase local blood circulation, which can effectively promote the metabolism and absorption of lactic acid and inflammatory metabolites, and during the activity must pay attention to keep warm, not to get cold, because the cold will lead to further aggravation of the situation.