Target Heart Rate and Cardio Monitoring for Safe Workouts

Maintaining a healthy resting heart rate is a key indicator of cardiovascular health, especially during high-intensity HIIT or IVF. Learn how to lower your heart rate while running and evaluate the accuracy of calories burned on heart rate monitors.

Young woman jogging by road in rural landscape

Blacking Out While Running

Published Jul,08 2011 | By Tamara Moffett

Blacking out involves a sudden reduction of blood flow to the brain that results in a temporary loss of consciousness. Sudden black outs can sometimes occur during high-energy exercise activities such as running. There are several reasons why a runner might black out.