A lot of people throughout the world travel by bicycle. Some of them ride their bicycles only for sport hoping to keep fit (dalabym tutaj przecinek) whilst others use their bicycles to reach particular places, such as a shop or a place where they work.
The bicycle is a good tool to keep the body fit. It allows you to lose calories, weight and strengthen 'you' YOUR muscles. What is more, riding a bicycle is a lot of fun, you can also get pleasure from 'ridding and sunbathe' (cos tu nie tak) .
I suppose that the most strong point for 'ridding' (RIDING) a bicycle is that IT is economical. – You don't need (tu cos brak) worry about fuel and 'it's' (to co napisales to znaczy 'it is', tutaj ma byc ITS)' prices, which usually go up every summer season.
In a sense, it is true, but you also lessen 'you' (jak masz na mysli 'twoja' to jest YOUR) fatty tissue while 'extreme physical effort' (cos tu nie tak).
On the negative side, you have to 'breath' (tutaj napisales rzeczownikm, a ma byc czasownik) car fumes and it is definitely detrimental to youR (co to jest z tym 'your'?) health and lungs. Especially 'that' (niepotr) if you have to move through cars that 'have' ARE stuck in a traffic jam. In such smoggy environment you are tired and sweaty, you need 'a' (niepotr) fresh air, but you receive car fumes instead.
To sum up, there are more advantages and the best choice would be an environmentally friendly 'rout' (co to jest?).
.... In the mountains or across a forest where you have a lot of clean air... to nie jest zdaniem)
'Ridding' RIDING a bicycle in streets where cars move would be a terrible choice.