Not all of them are huge. 8-)

http://www.trekearth.com/gallery/South_America/Colombia/North/Quindio/Qimbaya/photo509446.htm

 

If horses were not useful to humans they would already be extinct like wild horses already are I suppose. Instead there are a lot of types and breeds. Maybe horses've done it right.

 

Usually horses are not that "one man" animals like dogs for example, but there are always exceptions. And also horses do recognise people and have a great memory.

 

Nowadays they don't "break in" horses like you would imagine but give time to foals to get used to the tack and then to work on the lunge, to the weight of the rider and they are tought the signs of the rider patiently.

But it can be done quickly without violation as well:
http://www.youtube.com/watch?v=9Dx91mH2voo

 

To stay in the saddle you only need balance. :) That comes with practice. And you don't even need a saddle... ;) To actually control the horse is a more difficult job. Well, at least to do it well is.

 

Horses are "just" a hobby. I'm not a good enough rider anyway. :(