Good morning all. I was curious about the workout mats that Kelli and Dan use in their 26 min pilates video. The red and blue ones. They look nice and thick and I have a friend who is on the heavy side and has much trouble getting on her knees. She needs a very thick mat and I wondered where they got those ones? My friend was going to get one of this trifold gym mats but I feel these might be great for her.