Men who want to reduce their risk of prostate cancer may benefit doing more aerobic exercise, according to a new study. Researchers found that improving cardiorespiratory fitness by 3% over a year was linked to a 35% lower chance of the disease. Cardiorespiratory fitness is the ability of the heart and lungs to supply oxygen to the muscles during physical activity. Activities that this fitness level include jogging, cycling, swimming, hiking, and dancing. The study’s co-author, Dr Kate Bolam, said that such activities should challenge the cardiovascular system and both the lower and upper body. Prostate cancer is the most common cancer in men, affecting about one in eight men in the UK. The study, published in the British Journal of Sports Medicine, adds to the evidence that physical activity may play a role in preventing or delaying the disease. However, experts that more research is needed to confirm the causal link and the optimal type and amount of exercise.