Ooo so many reasons..
Because I have been diagnosed recently with a disability and would like to do as much as possible to improve my health and prove them wrong on the life expectancy.
Because I have just been ditched by my self centred partner of a decade and I'd like to look fit for all the saucy young chaps out there.
Because we were trying unsucessfully for kids and the mirror telling me I look seven months gone isn't exactly boosting my mental stability.
Because I'm now going to be alone and broke and my old skinny clothes have been sitting in a drawer taunting me for the last three years - if I can fit back into them I'd save myself a bundle!