There are several signs of relaxation in cats. For example, when cats lie on their back, it's a sign that they feel comfortable and secure in their environment. It also means they are exposing their vulnerable areas, such as their belly, which shows they trust you. Cats purr when they're happy and content. It's a sign that they feel safe and relaxed in their surroundings. When cats give you a slow blink, it shows trust and relaxation. It means they feel comfortable enough to let their guard down. Cats knead with their paws when they're feeling relaxed and content. It's a sign that they're happy and comfortable in their environment. Cats may sit with their legs tucked under them when feeling relaxed and comfortable. When a cat is relaxed, their body will be loose, and their muscles will be relaxed. They may also have their tail down, and their ears pointed forward or slightly to the side.