In a public seminar, a health expert stated that regular exercise can reduce the risk of heart disease. In a follow-up discussion, a member of the audience claimed that since he started exercising regularly, he has noticed an increase in his energy levels. Based on this discussion, the health expert argued that boosting energy levels is an important benefit that complements the reduction of heart disease risk.
Which method of reasoning does the health expert primarily employ in the argument about the benefits of exercise?