What is a horse riding exercise with a series of s shaped figures?

A horse riding exercise featuring a series of S-shaped figures is often referred to as "Serpentines." This exercise involves riding a series of smooth, curved lines that form an S shape across the arena. It helps improve the horse's flexibility, balance, and responsiveness to the rider's aids while also enhancing the rider's ability to maintain a steady rhythm and control throughout the transitions. Serpentines can be adjusted in size and complexity depending on the horse and rider's skill levels.