Abstract: A collapsible umbrella gym for an infant or toddler which is highly portable, and combines the desirable attributes of an activity arch and support mat such as an activity mat. The gym comprises a frame assembly which is selectively movable between collapsed and uncollapsed states. When in its fully deployed, uncollapsed state, the frame assembly assumes a configuration which provides the functional attributes of an activity gym or activity arch, with multiple toys or mobiles being suspended from the frame assembly at locations which are easily accessible to an infant or toddler lying underneath the frame assembly.