Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: I want to put these mats on my garage floor but I am worried they will shift around, should I have something underneath them to keep them in place?
Document: These are great mats, and they ship very quickly. They work well for a home gym. I highly recommend the black as it is easier to clean. The gray holds dirt deep within the cushion and requires alot of work. The black does not show it, so the color has a longer life.
This is a pretty good pad. I have a weight bench on it and drop dumbbells on it daily. So far, no tears.
They were shipped on time and they work great in my weight room. If you are using free weightsor heavy mmachines I do recommend a thicker padding.
Wanted a surface to work out on and this fit the bill. Very easy to set up and the included borders make for a nice finish.
Answer: no