If you prefer the top row of keys to always behave as standard function keys without holding the Fn key: 1  Choose System Preferences from the Apple menu. 2  Click Keyboard. 3  Click the Keyboard tab if it's not already highlighted.  Select Use all F1, F2, etc. keys as standard function keys.
In brief: Normal heart rate. Resting heart rate means the rate when not exerting effort, such as sitting, standing quietly, or lying down, usually 60-100 beats/min. A fit athlete will have a lower rate than an average person, as low as 40-60 beats a minute. Maximal heart rate is roughly 220- Age in years, Often, it is recommended aerobic exercise should be at 60-80% Maximal for healthy individuals.
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 ...