Physical activities

Hello!
I was walking in the park with my dog yesterday and I saw new benches near the lake - where you can just sit and dream on sunny days. There was also new simulator platform. There is no special building - just 10 or 12 trainers on the ares where grass used to grow. Today I decided to have some kind of physical training there. It was great to feel morning sun, fresh air and of course, to feel that your body works!
I used to think that people are lazy and they don't like to have physical activities at all! But I started to observe people in park - some of them were running, some having yoga practices and even some were even swimming in the lake (It was near 15 degrees C in the morning)!
I have my physical activities 3 times a week and I hope it helps me to have a good health, to be in a good mood and find new friends who are interested in being healthy too!
What kind of sport do you prefer?
And why do you have your physical activities?

[Excellent. At my age, I enjoy hiking the most.]

Physical Activities [From the essay, it is better to use "Exercising" instead.  "Physical Activities" sound too formal, cold and encompass too many other things as well. I.E. as opposed to mental activities]

Hello!

I was walking in the park with my dog yesterday and when I saw some new benches near the lake where you one can just sit and dream laze around [not wrong grammatically but sounds funny] on sunny days. There was also a new simulator platform[I don't understand what this is really]. There is no special building to house it. - Just 10 or 12 trainers [Again I don't understand the use of this term here.  So I am guessing.  Let me know if I am wrong in my guesses] a dozen or so people exercising on the grassy areas where grass used to grow. Today, I decided to have some kind of physical training there. [This means a kind of formal physical activity that you are going for, say to prepare yourself for some kind of a sport.  If it is of leisure, use "exercise" instead.  For example, "Today, I decided to exercisethere"]It was great to feel the morning sun, the fresh air and of course, to the feeling that your body is in good conditionworks!

I used to think that people are lazy and they don't do not like to exercise have physical activities [Eating, sleeping etc are considered as physical activity too] at all! But However, I started to observe people in the park - some of them were joggingrunning, some were having doing their yoga practices and even some were swimming in the lake where the temperature (It was near around 15 degrees Celsius in the morning!)!

I have my physical activities 3 exercise thrice times a week and I hope it helps me to have a good health, be in shape, stay healthy, keep me to be in a good mood and to meet find new friends. who These new friends are also interested to be in healthy too!

What kind of sports do you prefer?  What is the reason for exercising?
And why do you have your physical activities?