It’s complete, funny and thrilling. It’s complete, fun and thrilling.

It’s complete, funny and thrilling. It’s complete, funny and thrilling.

I just added a space after the comma here :)

It’s complete, funny and thrilling. It’s complete, funny and thrilling.

Whaty are you waiting to try it onut? Why are you waiting to try it out?

What are you waiting to try it onfor? What are you waiting for?

"to try it on" isn't typically used to describe an activity but more for trying on clothes/makeup etc.

What are you waiting on to try it on? What are you waiting on to try it?

The order was unusual. I would expect to see something more like this (in terms of natural flow): What are you waiting on? Try it!

LIKE A FISH IN WATERike a Fish in Water Like a Fish in Water

Titles are usually written in title case, unless there's a stylistic reason for doing otherwise.

I’ve practiced lots of sports throughout my life. Some of them were boring and dull, others exhausting and thrilling. I’ve practiced lots of sports throughout my life. Some of them were boring and dull, others exhausting and thrilling.

I’ve practiced lots of sports through my life. Some of them were boring and dull, others exhausting and thrilling. I’ve practiced lots of sports through my life. Some of them were boring and dull, others exhausting and thrilling.

I just added a space after the full stop - may have been a typo :)

I’ve practiced lots of sports throughout my life. Some of them were boring and dull, others exhausting and thrilling. I’ve practiced lots of sports throughout my life. Some of them were boring and dull, others exhausting and thrilling.

"throughout" is a more natural equivalent to "a lo largo de"

Despite that, I’m interested in plenty of them, Sand swimming’s always been my favourite. Despite that, I’m interested in plenty of them, and swimming’s always been my favourite.

Despite I’mbeing interested in plentylots of them, Sswimming’s always been my favourite. Despite being interested in lots of them, swimming’s always been my favourite.

what you said was technically correct but this sounds more natural and how a native speaker would say it. Also, no need to capitalise the "swimming" here :)

Despite how I’m interested in plenty of them, Sswimming’s always been my favourite. Despite how I’m interested in plenty of them, swimming’s always been my favourite.

Sometimes, "despite" needs something after it You could also say "Even though I'm interested..."

Swimming’s a truly a complete sport, and it’s also really exciting by the way! Swimming’s truly a complete sport, and it’s also really exciting!

putting "truly" before the "a" sounds more natural to me although what you said is also correct. "By the way" tends to be used for something more unrelated to the topic; for example, it could be "swimming's truly a complete sport. By the way, I watched that swimming show the other day" It doesn't have to be completely related to the main topic of conversation but it's normally used to go in another direction. "Also" is used more for adding something to your point :)

As your muscles are growing, your breath is getting better and your heart is bombpumping, your body gets relaxed and you have a lot of fun. As your muscles are growing, your breath is getting better and your heart is pumping, your body gets relaxed and you have a lot of fun.

As your muscles are growing, your breath is getting better and your heart is bombpumping, your body gets relaxed and you have a lot of fun. As your muscles are growing, your breath is getting better and your heart is pumping, your body gets relaxed and you have a lot of fun.

"Bombing" wouldn't be used here - "bombing" refers more to someone exploding a bomb or occasionally used in slang as to either be drunk or to fail at something.

And, what i's more, your skin is benefited bys from the warm water. And, what's more, your skin benefits from the warm water.

"what is more" is correct but it sounds more natural with the contraction. "Is benefited by" is also correct but a native speaker is more likely to say that the skin itself benefits from the warm water as, in English, you'd often personify things to describe them (e.g., your skin benefits from the warm water).

And, wWhat i's more, your skin is benefited by the warm water. What's more, your skin is benefited by the warm water.

"what's more" is how I am used to seeing the phrase "and" isn't necessary

A swimming suit and goggles are the only special objectsequipment required. A swimming suit and goggles are the only special equipment required.

A swimming suit and goggles are the only special objectsequipment required. A swimming suit and goggles are the only equipment required.

"Special" implies that something is uncommon. I changed it to "equipment" as it betters describes the swimming suit and goggles being things you need for swimming.