Resting heart rate (RHR) is a vital sign that reflects cardiovascular health and overall fitness. For adult men, a normal RHR typically falls between 60 and 100 beats per minute. Athletes may exhibit lower rates, while sedentary individuals may be on the higher end of this range. A high RHR, defined as above 100 bpm, can indicate conditions like tachycardia, often linked to stress, dehydration, or underlying heart issues. Conversely, a low RHR, under 60 bpm, known as bradycardia, may be normal for athletes but concerning if it leads to symptoms like dizziness or fatigue. Factors influencing RHR include physical fitness, age, stress levels, and lifestyle choices. To measure RHR accurately, it is best done in the morning while at rest. Maintaining a healthy lifestyle can positively impact RHR, and individuals should consult healthcare professionals if their readings are consistently abnormal or accompanied by concerning symptoms. Tracking RHR can provide valuable insights into one's health status.