Physiotherapy is an interesting choice! I had this idea for a site a while back when I was still trying to figure out what I wanted to do which would be a collection of resources (videos and books etc) that would guide you towards increasing your understanding of particular subjects. So I would have this problem where I could read any number of popular physics or science books but never really get to the sort of pre undergrad level that I needed to see what the subject was really about. Everything online was either way to advanced, I already thought I knew the content or I didn't think I needed to know a seemingly unrelated bit of maths for something in physics. Say you went to the site and wanted to learn more about Quantum Mechanics, then the site would say you need to know all this linear algebra and calculus and give you good resources for those topics. If you're interested, I'd quite like collaborate to start compiling a list for different topics around maths, physics and engineering to see whether the site is viable.