While traveling in Mount Lu, one of my best friends showed me the Eight Trigrams Boxing, which she practiced every morning.

While traveling in Mount Lu, one of my best friends showed me the Eight Trigrams Boxing whichthat she practiced every morning.

We both still had some littlengering problems after getting COVID-19, but obviously, she recovered much better than meI, even though I did so much to help myself.

So, I have started practicing the Eight Trigrams Boxing since the first day I returned to Shanghai.

I feel so good and have a great spirit after boxing every day, and the most amazing part is that my heart rate stayeds around 80 the whole time while I was sweating comfortably and feelt hot from the inside out.

EightALSO POSSIBLE: Eight Boxing Triagrams Boxing

Sometimes the spelling "triagram" is sometimes used. However, the word "trigram" is also used. (I am unsure whether they have the same meaning.)

While traveling in Mount Lu, one of my best friends showed me the Eeight Trigrams Boxingboxing trigrams/triagrams which she practiced every morning.

We both had some little problems after getting COVID-19, but obviously, recovering from COVID-19. However, she she recovered much betfaster than me, even though I did so much to help myselfbecome healthier.

So, I have started practicing the Eeight Trigrams Boxing since the first day Iboxing trigrams/triagrams since returneding to Shanghai.

It'sThey are amazing!

QUESTION: Are they part of tai chi? (Or different from tai chi?)

MY GUESS: I feel so good and have a great spirit after boxing every day, and the most amazing part is that my heart rate stayed around 80 the whole time while I was sweating comfortably and felt hot from the inside outa inner warmth.

ONE OPTION: It's a little like Ttai-chi, aka S (also known as "shadow Bboxing,") but far more simple.

Other options exist. This is merely a suggestion.

It's also a system of deep breathing exercises, butand it just takes you 12 minutes to practice.

While traveling in Mount Lu, one of my best friends showed me the Eight Trigrams Boxing, which she practiceds every morning.

You might also say "some techniques from Eight Trigrams Boxing"
If you say "she practiced every morning" it seems like she does not practice anymore; "she practices every morning" = it is still part of her daily routine

We both had some little problems after getting COVID-19, but, obviously, she recovered much better (faster?) than me, — even though I did so much to help myself.

- If you include not-necessary information, surround it with commas (in this case, you could delete "obviously" and the sentence still is 100% logical)
- You can use — to interrupt a sentence and show your own comment / how you feel about it

So, I have started practicing the Eight Trigrams Boxing since the first day I returned to Shanghai.

- Generally speaking, we don't use the/a/an with the names of practices — I practice karate/jiu-jitsu/Buddhism/Islam/piano/etc, no articles necessary
- Past vs present perfect is a bit difficult to separate... but in this case, since you are pointing to a specific point where you made the decision to start practicing, I think it sounds more natural with simple past. (ex: My friend studies ETB. She has been practicing since she was 12 years old. Inspired, I started practicing, too, as soon as our trip ended.)

I feel so good and have ain great spirits after boxing every day, and the most amazing part is that my heart rate stayed around 80 the whole time while, even though I was sweating comfortabprofusely and felt hot from the inside out.

While traveling in Mount Lu, one of my best friends showed me the Eight Trigrams Boxing, which she practiced every morning.

Adding a subject to the first half ("while we/I were/was travelling in Mount Lu, ...") would make it easier to read and sound more natural.

We both had some little problems after getting COVID-19, but obviousapparently, she recovered much better than me, even though I diworked so muchhard to help myself.

在這裡用obviously 的話就變成當然的意思了

So, I have startedbeen practicing the Eight Trigrams Boxing since the first day I returned to Shanghai.

or "I have started practicing ... on the first day I returned to Shanghai."

I feel so good and have a great spiritenergized after boxing every day, a. And the most amazing part is that my heart rate stayed around 80 the whole time while, and on top of that, I was sweating comfortably and felt hota charge of energy heating me from the inside out.

Eight Trigrams BoxBaduanjing

Wikipedia also lists these alternative names: Eight Pieces of Brocade, Eight-Section Brocade, Eight Silken Movements, Eight Silk Weaving

https://en.wikipedia.org/wiki/Baduanjin_qigong