Matsyasana Or The Fish Pose. Matsyasana or fish pose is an asana. This yoga pose got its name because if practices in water then it allows your body to float like.

Gently release the crown of your head (or the back of your head, if the crown doesn't feel available to you) back down on the floor, placing a minimal amount of weight on. It stretches the upper body and stimulates the throat and crown chakras. The fish pose provides a gentle stretch to the spinal cord.
मत्स्यासन (fish yoga posture) steps and benefits | boldsky.
Fish pose or matsyasana stretches the shoulders, chest, and the front body, including the throat, abdomen, and hip flexors. Therefore, like the name goes the person performing the asana looks just like a fish. The fish pose provides a gentle stretch to the spinal cord. According to sanskrit texts, practicing fish pose in water allows one to float without the help of your hands and feet.