".........To achieve the training effect, it is generally accepted that for a particular exercise the heart should be operating at between 70% and 85% of its maximum rate throughout a training session. Athletes use different training zones for different purposes, the 70% to 85% range is known as the "Aerobic Zone", and is a good guide for those seeking general fitness.

Maximum heart rate (Max HR) is therefore a useful reference figure to establish a person's ideal "Training Zone", the heart rate range which will give you a training effect. Maximum heart rates vary between individuals for a variety of reasons, including genetics, a history of training through childhood and sex, females commonly have a higher maximum heart rate than males..........."

Originally published in "Out There" number 10 in Autumn 1996 as part of a 3400 word feature titled "Serious Fitness" pages 64 to 69.