Remove custom post slug from url

Hi.
This really annoys me.
my custom post is ‘training’

I want this structure.
http://mywebsite.com/my-post

And the output is.
http://mywebsite.com/training/my-post

And is not possible at the time by a “nice” way, only is possible with a lot of juggle.

Implement a option on the rewrite parameter on register_post_type() that i can remove the custom post category slug