This command enters the game realistic mechanics that make survival slightly more difficult and accordingly the game itself. Now that will remain a little HP life, You will have giddiness and You will bleed.
How to use Realistic Mechanics Command Block
- Copy the command text from a file (Ctrl+A -> Ctrl+C)
- Launch the game and get a command block, to do this type in console /give @p command_block
- Put the command block on the ground
- Click on it right click and paste the command in the “Command console” (Ctrl+V)
- Activate the command block using the button or the lever