Anja you are redressing the balance.
My Dgs grandmother lives quite a distance away, she is older and has major health issues.
She loves the boys dearly but can not play or go to the park with them
So when she does see them which is not as often as us (we help with childcare) she makes sure she gets all their favourite foods and treats in.
Its her way of showing the boys how much she cares along with kisses and cuddles of course.
We on the other hand have the boys frequently and as with dogs, boys require walks and exercise.
As a youngster my DD played outside with her brother but if it was wet and cold would quite happily colour or play quietly, her brother on the other hand was out on his bike.
Times have changed and children are no longer 'let out to play' and parents and grandparents are watchful at all times.
Whilst in my own grandparents care, my grandmother would carry on with her own jobs.
However when baking knitting or crocheting she would always try to show and encourage me.
The cake tin was always full of lovely baking.
Difficult, if grandparents are looking after grandchildren to help working parents but are not as able as younger grandparents (young children can run fast!) it not be easy to get involved in exercise, trips to park etc
Some GPs are looking after several grandchildren of mixed ages.