As a personal trainer I often have new clients ask me what the correct heart rate training zone should be for fat loss. I have recently read message boards and forums with claims that to lose fat you should stay in the 120-135 bpm zone. The rational comes from the fact that under low level activity our physiology uses much higher percentages of fat as a fuel source. While maintaining this pace for 20-30 minutes will render benefits in weight loss and conditioning and is a good course for older participants or those with restrictions, the fact is the caloric expenditure is too small.
