published by the ACSM, a simple scale of intensity based on a
self-perceived rate of exertion is used. It is scaled from 0–10
with 5–6 being moderate-intensity exercise and 7–8 being
vigorous-intensity exercise.7 The ACSM guidelines clarify physical
activity intensity by describing sitting as 0 and the greatest
effort possible is 10, with moderate-intensity activity being 5 or
6 and producing noticeable increases in breathing and heart
rates, and vigorous-intensity activity (7–8) producing large
changes in breathing and heart rates.