Comments about Shock Athletic Interlocking Gym Flooring:
This mat works great for P90X. The secret is to put a carpet mat under it so it won't slip around as the other reviewers complain about. A dumbbell or heavy piece of furniture on one corner wouldn't hurt either. The carpet mat I use is the one sold at [...] They are used to keep your carpet from slipping around. Don't get a cheap [...] one.
Comments about Shock Athletic Interlocking Gym Flooring:
I picked this up at a local outdoor/sports store for the use with P90X as I also have concrete flooring. Obviously its not meant to be used this way as it splits apart at the interlocking seams. In the items defense though its not advertised as a workout mat. I'm sure its fine for equipment to just sit on.
Comments about Shock Athletic Interlocking Gym Flooring:
We purchased this to go down on a concrete floor to do P90X. It was a good value and we needed some cushioning for all of that jumping! During the jump training, the mat moves. During yoga, the joints split apart when you are pushing your feet in opposite directions. During Kenpo, I ripped some of the tabs because they got caught in the sole of my shoe! We aren't even done with the 90 days and this mat is just about done! It is nice and cushy, but overall I am very unimpressed with the quality.