In which scenario is medical clearance advisable before commencing exercise?

Medical clearance is especially advisable for individuals with a history of heart disease before they begin an exercise program. Those with such a medical history may have underlying conditions or risk factors that could be exacerbated by physical activity. Engaging in exercise without professional evaluation could lead to serious health risks, including heart complications.

In this context, medical professionals generally recommend an assessment to determine the individual's current heart health, any necessary precautions, and appropriate exercise recommendations. This approach helps ensure that individuals with a history of heart disease can safely participate in physical activity while minimizing potential dangers.

The other scenarios—having a balanced diet, no previous injuries, and being regularly active—do not typically indicate an increased risk that would necessitate medical clearance. A balanced diet and regular physical activity are generally viewed as positive indicators of overall health, and having no previous injuries suggests that the individual is physically capable of handling exercise without prior medical concerns.