1, muscles will produce a lot of "waste" after running, which will make feet feel more tired and sour. After running, the feet are seriously congested, and suddenly putting them in cold water will lead to rapid contraction of blood vessels, muscles and skin. After soaking in cold water, it needs to be soaked in hot water immediately. At this time, the contracted muscles and blood vessels will relax again. Through "collection and release", the "waste" produced in muscles will be excreted faster.
2. This method can't be used for people with bad blood vessels and bad heart, because after putting cold water, muscles, skin and blood vessels will contract, which will seriously stimulate blood vessels and heart. If the heart blood vessels are not good, it will easily lead to diseases and even sudden onset.