I just reached 'hero' level for sprint speed, I was wondering what the next level is?
I believe I just answered your question here in this post.
The number of cubes within your status image is determined by your activity on the miCoach support website. These activities include (in order of importance):
To speak to a member of our support team or to log a ticket please visit http://community-micoach.adidas.com/community/support/en/help/contact-us