@Marakesh I also have noticed leg swelling on Letrozole.However have always had a tendency to it in hot weather esp if inactive. What has helped noticeably since I started Letrozole 8/17 is walking.I was walking 1-2 hours daily and made a difference to many things - improved my sleep, helped with joint pain and my mood .I listen to music on my phone as I walk as I forget am exercising.Am not walking atm however as had eye surgery but hope to return to it when my vision is better.
I will say initially was hard to walk as was winter and was not keen on exercise but I found after a couple of weeks it became easier and oddly I wanted to do it as I felt better.