My body and mind are healthy and strong

Studies show that exercise keeps the mind in shape, too. I notice that if I go through a period of laziness and inactivity my mind gets sluggish, like my body. But when I'm consistent with exercise, even regular walking for 30 or 40 (or more) minutes a day, my thinking is clear and sharp.
Right now I am trying to avoid going into workaholic mode. I have a lot of clients right now and I can become ocd about work, sitting for hours at the computer and on the phone, doing business, completely zoned. The result is weight around my waist and belly, and feeling half dead.
My goal, and challenge, is to exercise an hour a day -- and I've managed to do it somewhat consistently, but this week, no. Yesterday I walked for 40 minutes, but didn't do yoga at all, which I need to do to feel healthy. I realized a long time ago that running, without real deep stretching, would wreck my posture and maybe other body parts eventually. I found yoga and studied it intensely for a few years, taking classes with very good teachers. For the last five years, I've had mostly a home practice.
In this five years, I've run less and less. I've been a runner for most of my adult life but it's become less enjoyable, and painful, yet I miss the aerobic high of running, so I'm not sure what to do.
Walking definitely is enjoyable -- I take my dog, Gracie, with me -- and it keeps me in some kind of shape, but doesn't give me that ripped feeling that more intense workouts (running) does. I'm looking at revamping my exercise regime.
Regarding yoga: when I consistently practice, even just a few sun salutations and some standing poses then some floor poses, my body feels balanced - I don't crave extra food and feel relaxed mentally and physically. Ideally, I would be able to practice outside - as that's what I love about walking - being outdoors. But right now, my yoga practice needs to be inside.
This morning I'm going for an hour, maybe walk and run...My body and mind are healthy and strong!