Regular exercise has significant benefits for cancer patients, according to the Professional Association of German Internists (BDI). Forty-five minutes of speed walking a day reduces mortality rates in patients with intestinal cancer by up to 30 per cent. Exercise also helps control weight problems, which is a risk factor for intestinal and breast cancer. Additionally, exercise has a positive effect on a patient's mental health. Active patients tend to be active in their social circles too. That contact provides additional motivation for the fight against cancer. "Only a few therapies for cancer patients have considered the connection between physical activity and treatment success rates," Martin Halle of the BDI was quoted as saying by DPA.