Spirit XT685 Owner's Manual page 35

If you enter your age during programming the console will perform this calculation automatically.
Entering your age is used for the Heart Rate programs. After calculating your MHR you can decide
upon which goal you would like to pursue.
The two most popular reasons for, or goals, of exercise are cardiovascular fitness (training for the heart
and lungs) and weight control. The black columns on the chart above represent the MHR for a person
whose age is listed at the bottom of each column. The training heart rate, for either cardiovascular
fitness or weight loss, is represented by two different lines that cut diagonally through the chart. A
definition of the lines' goal is in the bottom left-hand corner of the chart. If your goal is cardiovascular
fitness or if it is weight loss, it can be achieved by training at 80% or 60%, respectively, of your MHR
on a schedule approved by your physician. Consult your physician before participating in any exercise
program.
With all Spirit Fitness Heart Rate programs you may use the heart rate monitor feature without using
the Heart Rate program. This function can be used during manual mode or during any of the nine
different programs. The Heart Rate program automatically controls resistance at the pedals.
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