Best areas to take long walks (Istanbul)

Hi friends! So I've been fully enjoying the vast array of delicious foods here in Istanbul, but that doesn't mean I've been enjoying the clothes fitting a bit tighter. I love going on Protected content walks and figure it would be a good way to burn some calories. When I was living in Ankara, there were areas of the city where it wasn't advisable for women to walk alone- especially blonde foreigners. I live in Gumussuyu. Are there any areas in Beyoglu or Sisli in which I should avoid walking alone? I doubt there are, but I just would like to make sure.

Once again, thanks for all your help!

-Margaret