They had a very good discussion of this on Woman's Hour, I think last Friday. It sounds ridiculous, apparently the first image or statement is something like 'I'm ..... and I wobble' or have wobbly bits or something because they think women are put off sport by having wobbly bits!
Jenny Murray made the good point that they wouldn't address men in this way. Interestingly I seem to remember a man commenting afterwards in the posts they read out that it's a fallacy to think all men are sporty and confident.
Why don't they research these campaigns properly and find out why some women exercise and others don't and why don't they especially tackle girls at school which is where non exercising often begins.
On the programme they had a young woman who explained that she had taken up cycling but decorated her bike with flowers and things and that she wore ordinary clothes 'so that no one would make any judgments'. A wealth to think about there.
I saw them talking about this the other morning on Breakfast, they were saying they had tried to include women of every kind, young, old, fat, thin, disabled and able bodied of every creed and colour to show women that no matter who you are you can excercise in one way or another. It wouldn't make excercise but I suppose anything that sets you thinking in that direction can't hurt.
Sorry I didn't have time to read the link I will later..