this is typically on a 6 to 20 scale now that might seem kind of weird for people like why is it not 1 to 10 1 to 10 is kind of typical um what people use like uh how hard is this scale but it's called the Borg RP scale and the 6 to 20 is essentially because the um initially the theory behind that scale was that you were just add a zero to whatever your RP was and that would correspond to your heart rate