Essentials of bicycle exercise: When riding a bicycle, lean forward slightly, straighten your arms and tighten your abdomen. Use abdominal breathing, keep your legs parallel to the beam of the car, keep your knees and hips in harmony, and pay attention to the riding rhythm. The correct pedaling is divided into four coherent movements: pedaling, pulling, lifting and pushing. When riding, the sole of the foot first steps down, then the calf retracts backward and pulls back, then lifts up and finally pushes forward, thus just completing a pedaling cycle. Don't just use your toes, your calves get tired easily.
After exercise, relax the front and rear muscles of thighs and calves. There are many pictures on the Internet, as shown below (Source: Ultimate Fitness Encyclopedia)