There are many types of sports in the world that you could chose to play. There are many types of sports in the world that you could chose to play.

Grammatically this sentence on it's own is fine, but when you're reading with the sentence after it, it seems a little out of place. I tried to keep the language the same but make it flow a little a bit better.

Some people say that Ffootball is the most popular sport in the world because millions of people watch it on TV every day. Some people say that football is the most popular sport in the world because millions of people watch it on TV every day.

Some people say that Football is the most popular sport in the world because millions of people watch it on TV every day. Some people say that Football is the most popular sport in the world because millions of people watch it every day.

Saying watch it, already implies that it's on TV so it sounds a little redundant. Not necessarily incorrect, but a tiny bit odd sounding.

Many health experts suggest that doing any form of sports is crucial for our body to stay healthy. Many health experts suggest that doing any form of sport is crucial for our body to stay healthy.

I think doing in this context is more acceptable, but playing also works.

Many health experts suggest that doing any form of sportsphysical activity is crucial for our body to stay healthy. Many health experts suggest that doing any form of physical activity is crucial for our body to stay healthy.

Many hHealth experts suggest that doing any form of sportstype of physical activity is crucial for our body to stay healthy. Health experts suggest that doing any type of physical activity is crucial for our body to stay healthy.

I took out the many, because "health experts" is already implying more than one, so you dont need to put it in. I changed 'sports' to 'physical activity' here so that in the next sentence, 'sports' reads as a type of activity they aren't doing.

In spite of this, some people still do not work out or do not doplay any kinds of sports. In spite of this, some people still do not work out or do not play any kinds of sports.

In spite of this, some people still do not work out or do not do any kinds of sports. In spite of this, some people still do not work out or do any kind of sport.

This is thea reason why some people gain extra weight. This is a reason why some people gain extra weight.

the-> a is because it is one of many reasons. Saying "the" here implies that it is the only reason. If that is what you mean to say, then you have it correct.

This is the reason why some people gain extra weight. This is the reason why some people gain weight.

This is thea reason why some people gain extra weight. This is a reason why people gain weight.

I changed 'the' to 'a' because it is only one of a few possible reasons (not the only one). I took out the extra, when you say 'gain weight' it implies that it is extra weight.

This results in their immune system becomeing weak; thus, they face many health issues. This results in their immune system becoming weak; thus, they face many health issues.

Nice use of the semicolon. You've used it correctly here. I will say that it's something to beware of. Most fluent English speakers will never use it/don't even know how to use it. It is something that is often only seen in very formal/academic writing.

This results in their immune system becomeing weak; thus, they face many health issues. This results in their immune system becoming weak; thus, they face many health issues.

This results in their immune system become weak; thus,ened; and so they face many health issues. This results in their immune system become weakened; and so they face many health issues.

Thus sounds a little formal here, but isn't necessarily incorrect.

I believe that everyone should work out or doplay sports in order to remain fit. I believe that everyone should work out or play sports in order to remain fit.

I believe that everyone should work out or doplay sports in order to remain fit. and healthy. I believe that everyone should work out or play sports in order to remain fit and healthy.

Adding “and healthy” ties into what you were saying regarding the immune system and health

I believe that everyone should work out, or do sports in order to remain fit. I believe that everyone should work out, or do sports in order to remain fit.

ThaIt is as important as our jobs and other daily activities. It is as important as our jobs and other daily activities.

ThaIt is as important as our jobs and other daily activities. It is as important as our jobs and other daily activities.

Thatis is as important as our jobs and other daily activities. This is as important as our jobs and other daily activities.

Should you doplay sports to stay healthy? Should you play sports to stay healthy?

Usually you would say play sports as opposed to do. I don't think this is a hard and fast rule though, and it varies from sport to sport. For example, you go running/cycling, but play tennis and play sports.

Should you doplay sports to stay healthy? Should you play sports to stay healthy?

Should you doplay sports to stay healthyactive? Should you play sports to stay active?