User's legs are made of metal

Pros:
-metal does not appear till 2 hours after birth
-user can manipulate the metal
-user can change paneling on legs with ease
-user can use metal on other parts of their body when needed
-user never loses legs as metal contains their DNA
-user can test current technology and moduels

Cons:
-user can not remove metal from their body
-user must keep joints and feet like structures in all forms
-user cannot add small compartments to legs
-user runs the danger of causing cell damage to areas covered by metal
-user will still need a wheel chair on hand just in case
-user must do extensive research what they test

Weakness: rust
User gains on legs when unwell and cannot hide it