Exercise is a lifter of mood. What's more, the effects are immediate. You don't have to train for weeks to benefit, and even a brief, brisk 15-minute walk will do the trick.
'Depression' is a concept, not an illness. The need to blame is a personal issue, and blaming a concept is about as sensible as blaming the weather. Depression happens. In most cases it can be fixed, and in all cases it can be adapted to. Blaming is a choice, depression isn't.
Please share this brilliant and incisive video (watch it first though). It's loaded with practical advice and should be seen by as many people as possible (employers and schools please note). This is a useful resource for helping managers and others understand how to approach and support somebody suffering with depression (as 20% of us do!). Produced by writer and illustrator Matthew Johnstone, in collaboration with WHO, it is the follow up to I had a Black Dog, which I re-posted in February.