I did it for about a year, about 12 years ago. Was having a bit of a mid-life crisis, marriage breaking up, drinking too much, work suffering. Being a postie was many things - firstly bloody hard work, bikes were used then and I was given all the tough rounds - cycled miles. The hours were horrific to start - was agency initially, and was working from about 5am til 6pm 6 days a week! Was doing all the overtime going. I remember the feeling of walking out of work each day, and the unique experience of not carrying one thing/worry forward to the next day, a weird & fantastic feeling for me. I loved the mix of comradery in the morning, getting your round together, then the hours out on your own. It was the best mental & physical therapy I ever had. Got really fit, without trying. Gave it up after a year - found the combination of low wages & high hours wasnt good for my life work balance going forward. A great experience though.