You can also follow these steps: 1  Plug your device in to power and connect to the Internet with Wi-Fi. 2  Tap Download and Install. 3  To update now, tap Install. 4  If asked, enter your passcode.ou can also follow these steps: 1  Plug your device in to power and connect to the Internet with Wi-Fi. 2  Tap Download and Install. 3  To update now, tap Install. 4  If asked, enter your passcode.
One simple method to calculate your predicted maximum heart rate, uses this formula: 220 - your age = predicted maximum heart rate. Example: a 40-year-old's predicted maximum heart rate is 180 beats/minute. There are other formulas that take into account the variations in maximal heart rate with age and gender.
1 One basic method is just subtract your age from 220. 2  So if you are 30, your maximum heart rate will be approximately 190 beats per minute. 3  This method is considered more accurate for those under 40. 4  A slightly more complicated recent method is to multiply your age by 0.7, and then subtract that figure from 208. One basic method is just subtract your age from 220. 2  So if you are 30, your maximum heart rate will be approximately 190 beats per minute. 3  This method is considered more accurate for those under 40. 4  A slightly more complicated recent method is to multiply your age by 0.7, and then subtract that figure from 208.