The other 'F' word can nag at you in any form of fitness, be it walking, running, yoga, or circuit training.

You have to consider how you feel throughout the day and the level of exertion you can manage. Going too hard can leave you exhausted later on. So, when you're feeling tired and unmotivated, it's important to listen to your body.

However, occasionally, you might indeed need that motivational kick.