The correlation between physical fitness and mental health is a strong one, and I love the way this thread is organically expanding to cover the latter as well. Whilst going for a run, rowing (etc) won't necessarily cure low-mood, general anxiety or depression, it can certainly help. There's clear evidence that exercise - especially outdoors - will help reduce anxiety, and a basic level of fitness is useful in fending off other woes and ailments which won't help us feel any better about ourselves. 'tis a slippery slope, I know that from experience, as many on here do.
For my part, like Stu (but without the diabetes) my interest isn't weight loss but instead building muscle tone and general fitness improvement. I'm 6-foot tall and around 11.5/12st (I own no scales). I have no interest in looking like a night-club bouncer, but if I can get back to a higher level of aerobic fitness and better definition I'll be pleased. My man cave is home to a Concept 2 rowing machine, a Swiss ball and an assortment of free weights all of them embarrassingly dusty and all of which can be used to good effect while I watch 30 minutes of shite on YouTube. That's my goal - at least three times each week.
About two years ago I had testicular cancer (check 'em, boys!) and since then have struggled with managing anxiety and stress levels. Work, family being pulled every which way, a fear of non-achievement (what the **** is THAT all about??) - you all know what it's like. Where I have improved is in getting my ar5e out for a walk each day. For those of you that walk to work, I recommend the Active10 app, which measures not just steps but how brisk they are. It's helpful in making sure you're going just that bit quicker. I aim for 30 'active' minutes of walking each day, and generally manage. It's surprisingly easy. Living in the sticks helps as well, of course. Fresh air and coastal walks are an easy pull.
As Phil said, the 7-minute workout app is also excellent but, to my shame, it's probably 2 years since I used it. [kicks self in ar5e].
Dan, top thread!