He is 10 years old and doesn't know how to ride a bicycle. He gets desperate because he doesn't know how to turn the pedals even though I teach him. He gets frustrated quickly. He tries to get on his 5-year-old sister's tricycle, but he can't handle it and also gets frustrated very quickly. 

He is 10 years old and doesn't know how to ride a bicycle. He gets desperate because he doesn't know how to turn the pedals even though I teach him. He gets frustrated quickly. He tries to get on his 5-year-old sister's tricycle, but he can't handle it and also gets frustrated very quickly.