Anyone here tried Yoga...what do you think of it? Does it calm you? Does it make you feel stronger (both mentally and physically?)

I'm tempted to try it...I have alot of stress at work and I'm in need a good way to get rid of it...also I need to tone up bigtime...I've gained a bit of weight and I'm frustrated with myself for that but the more I try to lose it the way of the gym sometimes the more I get frustrated with myself...it sounds crazy but I'm thinking of trying yoga to branch out and try something different so I'm just curious to know what others might have thought about it...