What is the 12 rule of a treadmill?

Question:

What is the 12 rule of a treadmill?

Answer:

The 12 rule of a treadmill is a low impact cardio workout that you can do on your treadmill at home. This workout consists of putting your treadmill on a 12% incline, setting it so 3mph (5km per hour) and walking for 30 minutes. Its a great beginner workout to do on your treadmill at home.