One embodiment of a portable acrobatic training apparatus (I) with which to support and instruct athletes learning back handsprings having opposing flat vertical ends (16), a resilient arcuate uppermost surface (10), a flat horizontal base 12), and a convex near surface (14). Said trainer apparatus is of approximate elliptical shape, rests on its base until intentionally activated by user, is self-limiting rotationally and returns to start position automatically following each usage.