Heart rate reserve, not a flat percentage of maximum. The difference is where you start from, and at the easy end it is worth more than ten beats a minute.
Your numbers
1
In years. The estimate of your maximum is built almost entirely out of this, which is also why it is only an estimate.
years
2
Sitting still for five minutes, or before you get up. A rate taken after coffee or stairs will push every zone up with it.
bpm
2 still to fill in
Your training zones
Fill in the boxes and press Calculate. Nothing is worked out until you ask for it.
Age
Resting heart rate
Nothing is sent anywhere. The sum happens in this tab.
Most of your cardio should sit in the bottom two. The top is a garnish, not a diet.Read how this is worked out