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There has been an understanding that yoga improves physical function and emotional wellbeing, as chemotherapy—the commonly used treatment for cancer—causes fatigue and weakens the immune system. But it is only in the last few years that empirical evidence in favour of yoga's relaxation impact has been mounting. Adding to such evidence, a new study—the largest of its kind— has found that yoga not only provides relief from fatigue but also gives emotional benefits to women undergoing radiation therapy to treat breast cancer. The study was conducted by Anderson Cancer Center, the University of Texas, in collaboration with India's largest yoga institution, Swami Vivekananda Yoga Anusandhana Samsthana Bengaluru. Led by Lorenzo Cohen, the team analysed 163 volunteers suffering from breast cancer undergoing radiation treatment. The participants were divided into three groups: one group was put through a stretching programme, another was made to follow a yoga regimen, and the last group had to do neither. They found that women in the stretching group reported a reduction in fatigue after the completion of radiation treatment; women in the yoga group had additional benefits like improved emotional wellbeing and general health. The women who did yoga also recorded the highest decline in the level of stress hormone, cortisol. "I believe yoga is effective because it incorporates gentle movements, relaxing poses, and meditation and controlled breathing," says Cohen. It also helps reduce sympathetic nervous system arousal and thus regulates stress hormones, he adds. Cohen had conducted a study in 2006 on 61 women to analyse how mind-body intervention helps women undergoing cancer treatment He found that the women had improved social function, better sleep and less fatigue just a week after the intervention.