Abstract: A step platform for slow step exercises is provided and has a basic structural block which is formed as a solid block made of a lightweight styrene foam material and includes a plurality of first concave portions formed in a bottom surface of styrene foam by using a plurality of first hollow holes formed in a predetermined shape which includes a penetrating hole perpendicularly penetrating the styrene foam from the bottom surface toward the upper surface or which includes a non-penetrating portion formed inside the penetrating hole; and predetermined single or plural step plates for distributing a load and ensuring a load bearing performance, bonded or adhered to the upper surface of the basic structural block.