I have seen old people in the city, only 50 or 60 years old, who take medicine and injections all day long when they are sick. But my grandmother did the opposite. My grandmother is sixty-five years old this year, and she is still hale and hearty and very healthy. On a Sunday in late autumn last year, my mother and I went to visit my grandmother in the country.

It was the autumn harvest season, and grandma refused to be idle at home, so she let her mother cook at home and she took me to the fields. Grandma pointed with her hand and said, "This is our responsibility field." Let me see, wow! What a big cornfield. Some dry corn stalks are firmly covered with corn cobs, while others are "twins".

I asked worriedly, "When will all these corn be broken?" Grandma smiled and said, "What is this? It will be over soon. " I thought grandma was bragging and looked at her suspiciously.

Grandma said, "Don't you believe it? I'll show you. " Say it and break up.

I felt fresh at first, but after breaking off for twenty times, my hands felt sour and painful. At first glance, my palms are red and seem to be bleeding. So I got impatient and ran to the stream to catch fish. I only heard grandma's incessant "click, click" sound of broken corn. Two hours later, I picked up the original corn basket, which contained my trophies-three big fish and two lobsters.

But when I walked into the field, I saw piles of corn cobs. I was shocked. I can hardly believe my eyes. After returning home, I was still thinking: grandma had such a hard time in the countryside, getting up early and getting dark every day, but eating meager food. Why is her body so tough? I didn't understand the truth until I read such a statement in a magazine recently.

The magazine said: "labor creates people, and labor also makes people strong;" Labor can exercise bones and muscles, sweating can detoxify and so on. "Originally, grandma's hale and hearty is the result of labor!

No wonder there is a famous saying: "Life lies in exercise." Ah! I was very happy when I knew the answer. I didn't expect a simple "trip" to let me discover the mystery of fitness and learn knowledge, thus guiding my future life.