The video below discusses how to measure your training intensity and also the difference between ‘intensity’ and ‘output’. You should always try to use ‘intensity’ as your gauge and more specifically ‘perceived effort’. Many people will try to tell you that sports science has moved us forwards over the last 20 years, but in reality, it’s often just a ‘sideways’ or sometimes ‘backwards’ shift. Nothing will ever be as advanced as your own body and mind.