The first question when looking for gym flooring is what type do you need? For most uses gym flooring rubber mats are the best option as they are easy to fix and easily connected. All you need is a hammer and some glue, thats it !
To begin with you should decide on a thickness that suits your needs, for most people 15mm is enough and will provide more than enough vibration absorption and noise reduction, however, there are thicker mats available if needs be.
Rubber gym flooring usually comes in black as this is the best for hiding dirt and remains clean looking for longer.