“The tissue can stick together because fascia is not only a sheath around the muscles, it also has three or four layers and between the layers we have hyaluronic acid—the same fluid that’s in joint capsules,” Wilke says. The hyaluronic acid reduces friction to allow the layers of fascia to glide and move smoothly. If you don’t move, it’s possible that the fascia could become sticky and restrict movement, and if this theory is correct, it might explain why some people wake up in the morning feeling stiff, Wilke says. One idea behind pressing and massaging a muscle group with a foam roller or
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