By Mary Friedrich, Creator/Instructor of Sassy Pants Fitness for Active-Agers; AFAA Certified Group Fitness Specialist; Cancer Exercise Specialist (in progress) Note: It's important to talk with your oncologist and care team before starting any fitness routine. Research shows that for most people exercise is safe and helpful before, during, and after cancer treatment. It can help elevate mood, reduce anxiety, improve sleep, boost energy, and help reduce symptoms of treatment-related side...