Letting things go when they are no longer a feasible option could help to improve your well-being and fitness levels, according to a new study. Researchers from Concordia University and McGill University found that among breast cancer survivors, letting go of unrealistic goals and making new, achievable ones is linked with a higher quality of life and an increase in physical activity."By engaging in new goals a person can reduce the distress that arises from the desire to attain the unattainable, while continuing to derive a sense of purpose in life by finding other pursuits of value," study researcher Carsten Wrosch of Concordia University said in a statement.