A Rehab Plan is a template that contains injury information and exercises relating to that patients injury.
When you first create a programme for a patient it is always good to give them information about their injury as well. In some countries it is mandatory information required by a patients private health insurance scheme. However you do not always need to have injury information on a patients Rehab Plan, it is an optional step for you as a practitioner. You can always navigate away from the injuries list to the library of exercises using the "tabs".
Once anything is added to a Rehab Plan, any future searches will always just default to look in the exercise and advice libraries.
A Rehab Plan is created in this screen below: