Mental health.. News story triggered a panic attack

I don't know about the latest figures for exercise and recurrence, but it certainly has a huge impact on mental health - not just the endorphins released by the actual movement, but by the knowledge that this is something positive you are doing for your body.  Whether it be cardio, or muscle strength, or staving off osteoporosis, as long as you are working with your current limits and not injuring yourself, it's great.