A cartoon boy doing yoga in a flat illustration style on a black background with a simple and cute expression and bright colors. He has brown hair and is wearing an orange T-shirt with dark pants underneath his legs. He is standing on one leg while holding the other in front of him with both hands raised above head level. The pose should be playful and cheerful, capturing his excitement for movement and stretching activity. Focus on details like facial expressions or posture in the style of yoga.