Get a cardboard box and flatten it out. Cut into strips as long as you want them, but make sure they are wide enough for your hamster to walk on. Glue pieces together and secure it to the cage or play box.
Hamster training - Do not disturb your your hamster when s/he is eating, washing itself, sleeping, etc. Not only will it get annoyed and possibly bite, but it can destroy the trust it may already have for you.