Activity gyms are play areas designed for infants and young children to explore and develop their motor skills. They typically feature a soft mat with various textures, colors, and patterns, along with hanging toys that encourage reaching and grasping. These gyms provide a safe space for babies to practice tummy time and engage in sensory play. Many activity gyms also include features like mirrors, rattles, and crinkly fabrics to stimulate a child's senses. Parents often use these gyms to promote physical development and cognitive skills while keeping their little ones entertained. Popular brands include Fisher-Price and Skip Hop.