Which letter on the graph represents the minimum intensity for an athlete to train to produce a physiological improvement in performance? A - HSC - SSCE Personal Development and Physical Education - Question 15 - 2023 - Paper 1

To find the minimum intensity for an athlete to train for performance improvement, we typically look for the point on the graph where physiological changes begin to occur. This point is often associated with a letter that indicates the threshold. Based on similar studies and graphs, this point is generally represented by the letter D. Therefore, the answer is D.