Benefits Of Exercise - Lyrics

This task I had to find a well known song and create my own lyrics, but there's a twist. I have to create my own lyrics so that it explains the benefits of exercise. My song I did was Believer (By Imagine Dragons). I haven't quite finished it yet but this is what I came up with.
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First things first

I'ma say all the words inside my head

I'm fired up and tired of the way that things have been, oh ooh

The way that things have been, oh ooh

Second thing second

Don't you tell me what you think that I can be

I'm the one at the sail, I'm the master of my sea, oh ooh

The master of my sea, oh ooh

I was broken from a young age

Taking my sulking to the masses

Write down my poems for the few

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First things first

I’ma tell you how to stay fit and healthy

You need to exercise and eat healthy food, (Ooooo)

Eat healthy food, (Ooooo)

Second thing second 

Physical exercise can vitalise your body

Fitness reduces risks of death from cardiovascular disease (Ooooo)

cardiovascular disease (Ooooo)

I was overweight from a young age

Taking my hunger to the bottom

Write down poems for the few