While through many ways mind and body (physicality) are viewed as 2 entities they are one. Relaxing your body relaxes your mind. To take it further, physical exercise also makes you think better. It creates all kind off cocktails. Things like staying motivated with an idea, having energy, and not set back by feelings of failure. I also went through depression, and when I got to a better state off mind after therapy I was faster, sharper, more focused and more perceptive. It all needs to balance well together. Like a computer your as good as the weakest link.