A whimsical birthday card design portraying a charming cartoon character of undefined gender and race riding a stationary exercise bike decorated with streamers and balloons. The scenario is wrapped in a soft pastel hue background with sketches of confetti lightly scattered. Light scientific equations and symbols relative to cardio fitness gently float around this character, delicately blending the themes of wellbeing, exercise, and celebration together.

Generated with these themes: Bike exercise science.

Made with ❤️ by AI.