Legs that feel like lead are a common dream of being unable to move forward. Tradition reads it as reluctance, exhaustion or a feeling that something is holding you back.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.