The Candle Burning Guide - Center Burning Candles. Certain candles are designed to burn down the middle for different reasons, or a combination of different reasons. Candles with a unique finish, or unique burning characteristic, may burn down the middle in order to position the flame inside of the candle and illuminate from the inside out.
To find your maximum heart rate, subtract your age from 220. For example, if you are 40 years old, your maximum heart rate is 180 (that is, 220 - 40 = 180). Multiplying this by 50 percent and then 85 percent results in your target heart rate range of 90 to 153 beats per minute.
Target Heart Rate Your heart rate is one of the easiest measurements to take to determine your level of exertion during exercise. The American Heart Association recommends working in a safe target heart-rate zone between 50 and 85 percent of your maximum heart rate. An 18-year-old boy can find his maximum heart rate by subtracting his age from 220. This would put his maximum heart rate at 202 beats per minute, meaning he should exercise between 101 and 172 beats per minute. An 18-year-old girl can subtract 88 percent of her age from 206, putting her maximum heart rate at 190 beats per minute and her target heart-rate zone between 95 and 162 beats per minute.