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this is why you get light headed when you are sitting and stand all of a sudden because when you are sitting your blood tends to pool up in your legs and standing all of a sudden sends a sudden huge burst of a lot of blood to your brain. your brain gets a little oxygen starved when you are sitting. Source(s):
Standing or gentle walking your pulse should probably not go over 100 and certainly not up to 180 ... which is probably near or over your max heart rate (Max heart rate is 220 minus your age in years ... so if you're 40, your max heart rate is 180 ... and your target rate for vigorous exercise is 70% of that ... i.e. about 135 ...