A motivational coach

I was on at a great workshop yesterday. It was a meeting with the (a coach or my coach works better) motivational coach. In Poland it's very popular now. Especially now (that Generation-Y has grown up) when have been grown up the generation "Y". This was a very interesting and important workshop for me. She told us how we should planning our schedules. Each person has own a rhythm within a day. Some of us like to work and study in morning, others in the afternoon or in the evening. I know also(I also know)  people who love to work at night. And, we should use this a natural rhythm because in the  part of day when we feel the best our mind works the best. In At the same time we can't forget about sharing our new knowledge becuase(because) thanks to it we can active activate other parts of the brain. She (the antecedent of this pronoun is too far removed to use it effectively, therefore you should repeat the original noun here) The trainer said the best thing:  that the human brain was as a stubborn, lazy baby who didn't want to work and (but) the brain would do what we would teach taught him. We teach the brain something when we create a good habit. A habit is a behavior which we don't think, for example, when we close the door when we go out. I heard a theory that human needs 21 day to build a habit. On the one side hand it is so easy do something in the same way by for 21 days but on the other hand who wants to do it. But, this is a small key to success.

Nice job, most of the corrections I made had more to do with style and common usage as they had to do with actually fixing grammatical mistakes or spelling errors.