On November 7, 2016 (October 8, 2016 in the lunar calendar), the first Chinese space run, Jing Haipeng, ran for one hour in a row. The first Chinese space run: Jing Haipeng ran for one hour in a row on Tiangong-2. November 7, 2016 was the 20th day of entering Tiangong-2. Many people are concerned about how Senior Brother Jing and I exercise in space and how we feel different from ground fitness. Yesterday we mainly did a pull exercise and wore penguin clothes at night. The pull exercise is a strength exercise, once every other day. When doing the pull exercise, I did it according to the basic movements of the exercise plan. When Senior Brother Jing did it, the load increased compared with the previous period. We are still 15 days away from the return journey. Before returning, we have to move things to the return cabin, which requires a lot of physical strength. In addition, after long-term flight, we lose physical energy and our ability to resist overload is reduced. These all require preparation for muscle strength. Brother Jing has increased the tensile load and created a set of exercise methods for exercising the lower limbs and strengthening the leg muscles. The tensile is a soft rubber band. I made it into a ring and suspended it in the cabin. I was going to show my "new skills" and go through the ring, but I ended up wearing it halfway through, and the band was hooked on my body. Unfortunately, it didn't work. After dinner yesterday, we wore penguin suits and moved for about 3 hours and 10 minutes. The ground staff insisted that we wear penguin suits for exercise to maintain our muscle function. Wang Linjie, deputy director of the State Key Laboratory of Fundamentals and Applications of Aerospace Medicine, explained: In space, the bones and muscles of the human body will undergo certain changes. As soon as the muscles of the spine are relaxed, the natural height of the person will increase, which will affect the stability of the spine. The penguin suit is a physical protection for the body in a weightless state, which is equivalent to adding the lost gravity. Because it is loaded from the longitudinal axis of the body, it is a bit like a penguin when walking. Today, Brother Jing and I mainly exercise on bicycles. After I finished exercising in the morning, the whole state was still good. Since there is only one bicycle, often when one person pedals the bicycle, the other person is doing the puller. Generally, it takes half an hour to pedal the bicycle, and it does not take that long to do the puller. So the person who makes the puller will try to extend the exercise time and wait for the other person to cooperate with each other. The feeling of pedaling a bicycle in the sky is different from that on the ground. It is a bit like pedaling while lying down. It is not easy to work hard, and it is quite tiring. Wang Linjie explained: Their pedaling exercise is much better than we expected. From the records, Chen Dong's pedal exercise in space is close to his highest level on the ground. These days, we also have running exercise, and the running platform is designed with a restraint system. The running platform exercise is done according to the plan. The Chinese have not run in space before, and this is the first time. In fact, when we first started running two days ago, we couldn't run. It wasn't until the third day that Senior Brother Jing started running and ran for an hour at once. The ground staff asked us for half an hour. At that time, he was very excited and specially applied to talk to the ground to tell everyone the good news. Wang Linjie explained: Astronauts are curious about solving problems, but they can't run if they don't believe it. Our analysis shows that the initial inability to run is a problem of attitude control. For people who have just arrived in space, attitude adaptation takes time. Some difficult movements on the ground can be easily completed in the sky, such as somersaults, floating, etc. The sky is different from the ground. Muscles that are not usually used are now key muscles. For example, the strength of the upper arm is more important than on the ground. Standing or sitting on the ground, people say "the lower plate should be stable", while in the sky more use the upper limbs, and move the position with your hands. We need to strengthen the exercise of these muscles. This time we combined cycling, running, and also did a weightlessness cardiovascular research experiment, referred to as CDS experiment, which is divided into dynamic and static tests. When we exercise, we will wear a finger cuff on our left hand to record pulse blood pressure and so on. Before and after exercise, ultrasound images will also be measured to compare the changes before and after exercise. Wang Linjie explained: Exercise can help astronauts fight the effects of weightlessness. For example, blood volume is reduced, and blood volume is increased through exercise; muscle atrophy, and muscles are built through exercise.