A funny coincidence with the marginalia on f116v

[monisusa]

 so we practiced on a mat... 

OMG! 

Correct version: also on underlaß vbten

"on" = "ohne" not "auf"

and that is a not a "k" but a "ß" underlaß

also ohne Unterlaß übten = so practiced without ceasing (but "übten" is more "do it" difficult to translate into english)

Hi, JoJo_Jost. You are right. It reads: "so on underlaß vbten" ! = "so practised without ceasing".
The Umlaut "ü" was represented by character u, since in German Umlaut ä,ö, ü were not yet standardized.