After getting off the subway, Li Shu came to the center of Guangzhou, where there is a famous scenic spot, Zhujiang.

As the saying goes, when you come to a place, you must first visit various scenic spots. Shopping is also a form of cultivating your character.

During this period, the sun is shining brightly and there are four cold winds. The wind in this area is particularly fierce. No matter it is spring, summer, autumn or winter, residents living around, especially those on high-rise buildings, must close their windows at night, otherwise they will definitely hear the roar.

The sound of hunting.

Zhujiang is very close to Guangzhou Pagoda. The tall and thin Guangzhou Pagoda is very beautiful.

Li Shu planned to come back in the evening. After a hard trip, he could take a trip to Zhujiang tonight.

Of course, it's not swimming, but taking a boat for two laps along the river.

According to the mobile phone navigation, there are no good places nearby, there is only a children's martial arts gym, and Li Shu is not interested in this.

Speaking of Zhu Jiang, Li Shu found that he had not swam for a long time, and it was just a good time to practice his breath-holding efficiency and strength through swimming.

After some research, it turns out that the swimming pools here are called swimming clubs.

club……

It's a good excuse and a good name for being expensive.

The outdoor one costs RMB 6-70 a ticket, while the indoor temperature-controlled one costs over a hundred yuan.

After careful selection, Li Shu reluctantly chose one that cost around 40 yuan. Although the swimming pools were all outdoors, Li Shu took his fancy to this one.

In this season, there are fewer people swimming, which means there is more space for you to display.

After walking across three or four streets to the swimming club, Li Shu discovered an embarrassing problem.

He doesn't have any swimming gear!

Swimming trunks, swimming goggles, nose clips, and headscarves, he has none.

Although these are said to be dispensable, the equipment will also provide a higher guarantee for your swimming efficiency and physical safety.

The myth that poor students have more stationery does not apply here.

Before going into the water, Li Shu took off his clothes and wore only swimming trunks, shivering a little in the cold wind.

Although he is more tolerant of cold than ordinary people, the goosebumps on his skin can't help but stand up.

Warming up by the water mainly stretches the muscles of the arms and legs to prevent cramps and accidents underwater.

The lifeguard was sitting on a high chair, also wearing a small down jacket, with a thermos cup of hot tea at hand.

Their work was quite leisurely. There were no people in the entire 2-meter pool, and including Li Shu, there were less than ten people in total.

And almost all of them are old men. Some of them are used to swimming and never fail to swim all year round. Some of them specialize in winter swimming because they think it can strengthen their health.

Indeed, if you have no physical ailments, winter swimming is indeed suitable. It can not only strengthen your cardiovascular system, but also keep your skin shiny and youthful.

A few minutes later, after finishing his warm-up exercises, Li Shu went into the water and swam briefly back and forth to stretch his muscles and pores and get himself excited.

Because he was just warming up and not pursuing speed, Li Shu slowly swam two laps of the breaststroke.

His mobile phone was saved, and only the smart watch he carried with him was still on his wrist.

Li Shu used it to record his swimming speed and heart rate.

The watch shows that his heartbeat rate is generally around 50-60 beats on weekdays, and hovers between 80-100 beats when swimming.

In fact, this is not a normal person's heart rate, especially Li Shu's daily heart rate.

According to statistics, people who swim regularly will have increased heart mobility, stronger contractions, increased blood vessel wall thickness and elasticity, and increased stroke blood volume.

In other words, the heart becomes stronger and more powerful during exercise.

Therefore, people who swim frequently usually have a daily hard work of about 50-60, but Li Shu does not swim often, and what affects his heart rate is various other exercises and stress on the heart!

He hadn't noticed it before, but he didn't notice it until he checked his heart rate on a whim today.

Next, he will use his watch to record his swimming speed and swimming heart rate.

He used freestyle and jumped into the water.

The swimming pool is a standard length of 50 meters. He recorded his speed by doing 15 round trips, that is, 30 50-meter rounds, and 1500 meters as one time.

Now that Li Shu has mastered the breathing technique, he no longer needs to tilt his head to explore the water and breathe in and out as his arms swing.

It was almost half of the original breathing rate. In order to reduce resistance, Li Shu even turned his head just enough. His mouth came out of the water, and he immediately exhaled and inhaled like a dragonfly touching the water, and then his arms accelerated.

In this way, in order to match the current breathing frequency, Li Shu had to speed up the movements of his hands and feet appropriately, otherwise his breathing rhythm would be disrupted.

Once the breathing rhythm is interrupted, endurance and speed will be greatly reduced. For a professional athlete, rhythm is a key factor in determining performance.

According to international standards, as long as you swim 50 meters every minute and 1,000 meters within 20 minutes, you are considered good.

As for the frequency of arm strokes of ordinary young people, they need to stroke about 40-50 times for 50 meters.

And those top professional athletes often only need 25-30 times.

And Li Shu's upper body strength is also very strong now, and he is definitely in the first echelon among people of the same size.

Although he has not received professional swimming training and is certainly unable to use all his strength to push himself, his results are not bad. He only needs to stroke his arms 34 times for 50 meters.

24 minutes later, Li Shu finished swimming 1,500 meters. He felt a little strenuous. After all, he had not been swimming for a long time. His fingers and toes all became wrinkled. He did not get out of the swimming pool immediately because the temperature difference between the inside and outside was too big.

The specific heat capacity of water is very high. Because of this, Li Shu stayed in the water for a period of time, and even the water was much warmer than the air outside.

After resting for a while and regaining his strength, Li Shu came out of the water.

I went to a convenience store and bought a bottle of energy drink to replenish water and salt in my body.

Next, he swam 1,500 meters twice more. Although his results were not as good as the first time, they were still excellent.
Chapter completed!