I'm looking to buy an exercise mat, because I have hard wood floors in the room where I exercise.

Does anyone have any suggestions? Are some better than others?

Thanks in advance!

Are you looking for a mat for yoga, Pilates, or for floor lying strength exercises?

What I would choose would depend on what you plan on using it for.

Yoga mat has various benefits to make Yoga more easy and stress free. the right mat will give some comfort and perfect support and stability for your body throughout yoga session.
I want to suggest you to buy yoga Cork yoga mat for better sustainability and support, Also you can check for eco friendly non toxic yoga mats.
For best options and quality exercise yoga mat please do check for thick exercise mat from Zenvibes.