The calf feels hard because of the excessive exercise load, which leads to anaerobic metabolism and lactic acid accumulation. Instead of growing muscles.

1, running mainly uses the forefoot to exert strength, so the heel will be suspended and the achilles tendon will naturally be tense. After running, the achilles tendon will be stimulated to thicken, so the calf feels tight.

2. The calf is natural after running, indicating that the exercise is in place. A few minutes' rest will be normal. You can also sit down and knead the tense parts of your muscles with your hands to relax.

3, it can also be a warm bath to promote blood flow, and it is also one of the good ways to release lactic acid from the calf.

Extended data:

Eating more fruits and vegetables can help the body metabolize lactic acid, while eating more meat is not good for lactic acid metabolism. So it is enough to add more starch and protein to your diet. For example, you can eat one more egg every day or drink one more glass of milk with sugar.

People with lactic acid accumulation need adequate sleep, which is conducive to the recovery of physical fatigue. If you don't get enough sleep, you will feel very tired even if you don't exercise vigorously. This is the problem.

References:

Baidu encyclopedia-calf

References:

Baidu encyclopedia-lactic acid