For fans of the hit YouTube show Cosmic Kids, this original picture book teaches kids easy yoga poses and mindfulness through a fun, interactive story. Sarah receives a mysterious letter inviting her to the top of the mountain for a party. But to get there, she'll have to face dark woods, a raging river, and the mountain itself! Can she be brave and make it to the party? Find out in this brand new Cosmic Kids adventure, and practice yoga and mindfulness with Sarah as you read along!