If you look around you, you may notice that many things come in a triad. This is because registering a concept in a set of 3 is very easy for the brain to comprehend.
This is why we celebrate Gold, Silver and Bronze for events, because if we had a fourth option, it would be more difficult to remember. This is also why many books are written in 3s, such as trilogies, or the 3 musketeers.
This is why the power of the triad becomes so important in any kind of rehab protocol. If we focus on groups of three, the brain and the body, plus the spirit (see what I did there??) will be impacted in a much more powerful way.