This little command adds some realistic mechanics to Minecraft, such as paths, being cold or blood loss! It's not intended to be a big command as my normal creations. It's just a little, not very laggy command, that you might want to use in your survival-world.
https://www.youtube.com/watch?v=rjWJDESiK7Q&index=8&list=PLyXAokTk6BI4KvBPxYQSwYAZIFqx8bFjG
You can see a command has say Have fun you can edit by command block