I bought the Fast Exercise book and I have the app.
I started doing the ladder strength exercises routine as outlined in the book back in 2013 but ended up in Bristol Spinal Unit. Will spare the details but it contains quite a lot of exercises my consultants had their heads in their hands at. Apparently it resulted in them seeing a massive rise in injuries.
Since then I have not been allowed to do the type of exercises in the book. Would swimming count as a strength exercise because of the resistance? I do do the bike fast exercise as the cardio one