“… 6 , 7 , 8 , 9 Indeed, a robust body of evidence now exists on the safety and effectiveness of exercise as medicine, either during or post-cancer treatments, to improve various health-related cancer outcomes, such as fatigue, quality of life, cardiorespiratory capacity, neuromuscular strength, physical function, body weight, and body composition (both fat mass and lean mass), as well as the ability to alleviate symptoms of anxiety and depression. 10 , 11 , 12 , 13 , 14 Furthermore, exercise is associated with a lower risk for the development of a range of cancers as well as reduced recurrence and improved survival in patients with cancer. 15 , 16 , 17 The underlying mechanisms are not yet fully understood; however, over the past 2 decades, several avenues of preclinical and clinical research have investigated the effects of acute and chronic exercise-conditioned serum on different cancer cell lines in vitro (e.g., breast, prostate, and colon).…”