* Make sure you're breathing easily. Another way to make sure that you're not running too fast is to make sure you're not out of breath. If you're huffing and puffing at any point during the run, slow down and make sure you can take deep breathes.
* 确保你能容易地呼吸。另外一个方法确认你没有跑的过快的方法是确保你没有上接不接下气。如果你任何时候在跑步过程中气喘如牛,降低速度并且确保你能够深呼吸。