You should make goals about achieving your target heart rate... Your goal during exercise should be 60% - 80% of your maximum heart rate (which can be determined by subtracting your age from 226). HOWEVER as long as you feel alright, your heart rate should not be a problem. I would worry only if you feel light-headed, dizzy, like your heart is really pounding or racing, if you feel faint, get blurred vision, or have shortness of breath. As long as you don't experience those things, it shouldn't be a problem. Even the target and maximum heart rates are estimates, every individual is unique and their body responds to and tolerates exercise in different ways.
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