How low can a human resting heart rate go? A low resting heart rate is often a sign of good cardiovascular health, but just how low can it drop?

Brazil's central bank has an inflation target of 3%, plus or minus a margin of 1.5 percentage points, known as a "tolerance interval", which was exceeded for the ninth consecutive month.

Our top picks for the best heart rate monitors include chest straps, smartwatches, and budget options. Find accurate models from Garmin, Polar, Fitbit, and more.

Struggling to stay in zone 2 on your runs? Learn how to find your real heart rate range and why it matters for marathon training.

Abnormal heart rate If you experience irregular heartbeats, including a racing heartbeat, slow heartbeat or a feeling of fluttering in your chest, you may be experiencing a heart arrhythmia.

DEAR MAYO CLINIC: When I go for a walk or to the gym, people always seem to be checking their pulse, whether by hand or with a wearable. Why is heart rate so important?

The American Heart Association says the target heart rate for healthy adults is 60 to 100 beats per minute.

Trainers explain what your heart rate should be when you walk versus run, and how to lower your heart rate when you run so workouts become easier.

Cardiovascular exercise helps strengthen your heart, allowing it to pump blood more efficiently and improving blood flow to all parts of your body.

The first step in finding the target heart rate that will maximize your cardiovascular exercise is determining your maximum heart rate. Your maximum heart rate is 220 minus your age.