Shake a cup is a vessel that people who exercise often use to hold water. Hot water is not allowed. Although its cup body is made of high-temperature resistant material, its cup mouth has rubber, which is not high-temperature-resistant. Filling hot water will lead to the aging of the rubber at the mouth of the cup, which will lead to the decline of the sealing performance of the cup and make the water in the cup seep out, which is more troublesome. This kind of cup is commonly used by fitness athletes. It is convenient and can replenish water for athletes who feel thirsty after exercise. There is also a spring on the shaking cup to stir evenly. If you stir things with this cup, this spring helps to stir the contents evenly.