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.
Before giving a number for a normal adult heart rate, it is worth pointing out that everyoneâs heart rates rise and fall depending on what they are doing or have just done. A normal resting heart rate (when you are sitting still) is somewhere between 60-90 bpm (beats per minute). Your heart rate will be higher if you have just had a drink of tea, coffee or cola, or been active. Your heart rate is usually lower after you have been resting and during sleep.