BETA
Chapter 1
The engine in your chest
Chapter 2
The magic on your wrist
Chapter 3
Mastering the five zones
Chapter 4
The art of recovery
Ch 1 · The engine in your chest
coach The Fuel Shift
Fat to carbs, fat to carbs / We cross the line when the heart beats fast
coach Electrical impulses from the sinoatrial node drive the heartbeats that define your resting fitness baseline and maximum safe stress limits.
coach The 1957 Karvonen formula established the science behind modern wearable heart-rate zones.
Fun Fact
The heart's daily work: Your heart beats about 100,000 times a day, pumping roughly 2,000 gallons of blood through 60,000 miles of blood vessels.
Glossary
heart (noun)
A hollow muscular organ that pumps blood through the body by rhythmic contraction and dilation. The human heart beats roughly 100,000 times daily, a metric monitored by modern fitness tracking watches.
A hollow muscular organ that pumps blood through the body by rhythmic contraction and dilation. The human heart beats roughly 100,000 times daily, a metric monitored by modern fitness tracking watches.
Quiz
What is the name of the heart's natural pacemaker that generates the electrical impulses for each beat?
Quiz
Which Finnish physiologist published the famous 1957 formula that uses heart rate reserve to calculate personalized training zones?