Option #2: Ignore Your Watch
Some days your body just cannot perform at the same level you know it could on just about any other day. There’s nothing particularly wrong; you just lack the usual snap in your legs. It can be frustrating to perform key workouts in this condition and see pace or heart-rate numbers that are far off your targets. So why not just ignore the numbers and complete the planned workout by effort instead? You will get a stronger training effect than you would get from abandoning the workout, but without the frustration of measuring your subpar performance. Choose this option if, after warming up and beginning the main portion of your workout, you feel overwhelmed by the planned pace/heart rate but still able to do the workout if you just dial back the throttle a bit.