In the fitness circle, the blood volume of a character is determined by how many "small hearts" he has. If the number of red hearts is not replenished in time under the attack of Boss, resulting in the number of "red hearts" becoming zero, it will fail.

In the Boss war, there are two ways to enrich blood. One is a specific action, such as hip lifting action, which can supplement _. The other is to drink supplements, such as spinach juice.