When viewing content in the planning tools, you will see a button labeled "Share". This button will allow you to share exercises, sessions and more with other users in the DCC.
However, after clicking "Share", your list of recipients may either be empty, or you may be unable to find a certain user. Sharing is currently limited to other users you are in a course with. We will be expanding sharing capabilities in the near future. In the meantime, you could always export an exercise or session to PDF, and then email that to anyone you'd like to share it with.