With more and more people getting into cycling in this country, the more I see people riding their bikes that are not properly fitted to them. The most common is the seatpost height adjustment - either it's set very high or very low.
I saw this very informative video on bike fitting when I was browsing around YouTube. It teaches the basic ways of getting properly fitted to one's bicycle. As I said in the Facebook page, it's not perfect as bike fit is unique per rider, but it does show you the reason behind adjusting a component a certain way. Warning lang: medyo deadma iyong nag-e-explain.
If you like it, share it on your social network feeds and inform others about it.