I do that too, with the planks and woodchops. I put the mat on the floor right under the cables for my planks, and when I do the woodchops I rest the mat on its side on the wall right next to me. One day I did that and when I started the woodchops a guy walked over and grabbed my mat!

It was obvious I was using it. Some people. . . .you have to grab and hold your territory in the gym!
