Yeah for sure. No one would ever consider me some prime physical specimen but the amount of time I've spent walking, riding my bike, hiking, etc is the only thing that's kept what sanity I have left. I try to not eat like shit either. Not perfect in that respect but I do pretty well. If I look back at the past year and times I was feeling down--guess what I was also not getting enough activity and eating a shitty diet. They go hand in hand.