Looking for advice please...
I am extremely unfit, can't remember the last time I did any exercise
and overweight - need to lose about 3 stone. I want to start exercising to become healthy, increase my fitness levels and also to lose weight. But I don't know where to start??? 
I also have sciatica as well as other back problems relating from a car accident so don't want to do anything that would aggravate these, would be great if I could strengthen my back at the same time.
So, what is the best form of exercise for someone like me?