Walking helped when my legs or ankles got swollen...but I only had that problem when I was dealing with blood clots. Also, my mom had surgery and her legs got swollen and her dr told her to try moving around more and it would help.
Are your legs hurting at all, or just swollen?
I'd probably give your GI a call and tell them if this is a new symptom for you, as it could be from other things. I've never been on pred long term so I'm not sure if that can be a normal thing with pred...maybe someone else will read and let you know if the pred can cause swollen legs and feet.
32 yr old female-dx with Crohn's in '97 after emergency resection and appendectomy, 2nd resection '05, Bilateral pulmonary emboli 10/09
Currently on Humira, Omeprazole, Effexor, Seroquel, Calcium, Vit D
Coumadin stopped 3/15/10!!!!