In this world under the zombie apocalypse, the game will try to create a development logic that is close to reality. You need to rely on knowledge and experience to foresee the results of different actions and adapt accordingly, so as to make better choices.
Foreseeable adverse consequences likes drinking unclean water may lead to illness, overexertion will affect the state of the next day, strong negative emotions will cause insomnia, loud noises can attract zombies from far away, etc. On the contrary, by exercising every day you can gradually become stronger, you can become more proficient with frequently used weapons, you can build and consolidate your base to be safer, you can unlock more craftable items through research, you can actually reduce the total amount of zombies by killing them, etc.
The zombies here are not slow-moving. On the contrary, they are like a new species that is good at exterminating humans. They can run and even mutate into more troublesome abilities over time. You're racing against zombies. Make good use of the resources left by mankind, otherwise you will fail miserably.