I think series because parallel circuits have too many breaks
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Target heart rate is generally expressed as a percentage (usually between 50 percent and 85 percent) of your maximum safe heart rate. The maximum rate is based on your age, as subtracted from 220. At an 85 percent level of exertion, your target would be 145 beats per minute.
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Well there's no real answer as to what the meaning is but it may sound cheesy or whatever but its basically what you want it to be. If you want to live and start a company or work a 6-5 job or take a vacation. It's really up to you on how you see it and what you want the meaning to be.
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