Mountain cClimbing rRefreshes mMy bBody and s& Soul

"&" is just a special character that means "and"

This is surely because I have been sedentary almost daily by staying home. all day.

To keep fit, I got to take atried to go out on walks, but since I ended up just wandering around aimlessly, bearingthey all bore no no fruit.

The mountain trail was so twistinged and steep that while I was climbing, my heart was racing faster almost hitting my throat.

Talking with these frank "Mountain friends" invigoratesd me.

Thanks to theis daily routine, I started to lose weight recently.

I took mya chance forto improve my health and that introduced me to mountain climbing, which has kept me cheerfulalhy both mentally and physically.

You can't apply an emotion like "cheerful" to physicality. It sounds a bit awkward, that way

After I retired last April, before I knew it, I put on nearly 6 kilos before I knew it.

This is surely because I have been sedentary, staying home almost daily staying home.

To keep fit, I got up to take a walk but ended up just wandering aimlessly, bearing no fruit.

The mountain trail was so twisting and steep that while I was climbing my heart was racing faster, almost hitting my throat.

That said, when I looked back once reaching where the slope became gentle, Sagami Bay and the Miura peninsula came into view beyond a row of houses.

Talking with frank "Mountain friends" invigorates me.

"frank" as in "honest"?

Also, I get to find pleasure in thinking about who I can meet today on the mountain.

I took my chance for my health and that introduced me to mountain climbing, which has kept me cheerful both mentally and physically.

The expression of "taking a chance" is like 機会を取る so I'm not sure what it means in this context?

After I retired last April, I put on nearly 6 kilos before I knew it.

It looks like you wanted to say that you were surprised in some way. With your sentence, I think it would be a little more clear using a different expression as a separate sentence. For example, "I was surprised." or "It happened so fast."

This is surely because I have been sedentary almost daily staying at home.

To keep fit, I gothave to take a walks but ended up just wandering aimlessly, bearing no fruit.

The mountain trail was so twisting and steep that while I was climbing my heart was racing faster almost hitting my throat.

I am not familiar with this phrase about my heart hitting my throat. I think the phrase you are looking for is "...it felt like it was going to beat out of my chest".

Talking with frank "Mountain friends" invigorates me.

I am a little confused with the word "frank" here.

I took my chance for my health and that introduced me toFor my health, I decided to start mountain climbing, which has kept me cheerful both mentally and physically.

"to take a chance" in English is quite weird. I think we would use it when there is only a limited time to act on something.

Mountain cClimbing rRefreshes mMy bBody and sSoul

Capital letters in titles

This is surely because I have been sedentary almost daily while staying at home.

To keep fit, I got to takehave to / must take a walk / go for a walk but ended up just wandering aimlessly, bearing no fruitwith no results.

'Bearing no fruit' doesn't really fit naturally into this context.

The mountain trail twisted so much and was so steep / was so twistingy and steep that while I was climbing, my heart was racingraced faster, almost hitting my throat.

That said, when I looked back once reaching where the slope became gentle, Sagami Bay and the Miura peninsula came into view beyond a row of houses.

Talking with frank/ conversing with these honest / down to earth "Mmountain friends" invigorates me.

'Frank' is not often used in this context, but wouldn't necessarily be completely wrong.

After I retired last April, I put on nearly 6 kilos before I knew it.

This is surely because I have been sedentary almost daily staying, at home.

To keep fit, I got to take atook walks but ended up just wandering aimlessly, bearing no fruit.

And sSo last Autumn, hoping to strengthen my legs, I made up my mind to go up to the local mountain that has a vast tangerine orchard.

The mountain trail was so twistinga labyrinth and so steep that while I was climbing my heart was racing faster, almost hitting my throat.

As I kept climbing the mountain every day, I came to exchanged some words with the local people.

Talking with frankhonest "Mountain friends" invigorates me.

Thanks to the daily routine, I started to lose weight recently.

I took mya chance for my health and that introduced me to mountain climbing, which has kept me cheerful both mentally and physically.