are working to hard! I'd also recommend heart rate training. You will find yourself primarily working in the aerobic zone, but if you find it getting too difficult you're probably entering your anaerobic zone and will tire very quickly, probably within a few

frequently gone away and I can continue. – LauraFTune into your heartThe thing that worked for me was putting on a heart rate monitor for the first time. Straight away it told me I was putting too much effort into my long runs. There were times when I

think the "fat-burning" low-intensity zone is a myth, and that high-intensity exercise burns more total calories, and more fat, per unit of time. The most important factor is the distance you run. However, running at around 70% of maximum heart rate