Which of the following factors is necessary to establish if a client is low risk?

To determine if a client is considered low risk, the client must have fewer than two risk factors and be asymptomatic. This criterion is essential because it aligns with the stratification of health risks associated with exercise. When an individual has no more than one risk factor, they are generally deemed to have a lower likelihood of experiencing adverse events during exercise. Additionally, being asymptomatic indicates that there are no present symptoms suggesting cardiovascular or other health issues. This combination of criteria helps professionals in the exercise field to reassure that the individual is appropriately low risk for exercise participation.

In contrast, the other options do not fulfill the definition of low risk. The presence of cardiovascular disease clearly indicates an elevated health risk. Having at least one risk factor does not suffice for a low-risk classification, as more than one can escalate risk levels. A symptom check from a physician may be a part of the overall assessment process but does not specifically establish low risk in the same way as having fewer than two risk factors and being asymptomatic does.