1) Monitoring your heart rate during exercise is essential to success in meeting your fitness goals, especially if those goals revolve around improving cardiovascular health and weight loss.

2) because they're obsess using gadgets

3)increases the risk of many adverse health conditions

4) reduce your risk of a heart attack.

manage your weight better.

have a lower blood cholesterol level.

lower the risk of type 2 diabetes and some cancers.

have lower blood pressure.

have stronger bones, muscles and joints and lower risk of developing osteoporosis.

lower your risk of falls.

5) Rest gives your body time to replenish these energy stores before your next workout