220 minus age x0.6: The general rule for an aerobic workout, assuming you have no health reasons not to work out vigorously, is to aim for a heart rate of 60 percent of max, which is 220 minus your age (so your max is 220 - 23 or 197, and 60% of this is 118). Note that this general rule is controversial, and not everyone believes in it.
Answered 8/11/2018
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