I had surgery for prolapse. I didn't think that walking affected the prolapse. Some exercises are bad for prolapse. There's an Australian women's health physio called Michelle Kenway who has a website and gives appropriate exercise and activities. Heavy lifting does make it worse and should be avoided post surgery as well.
Once things are back to normal, it is worth asking your GP to refer you to a Urogynaecologist for advice on whether a pessary, surgery or some other treatment is best for you.
Alphabetical girls and boys names January 2024