Bouncing River Stone Set (5 pcs.) combines one Bouncing River Stone—with a soft base, rigid top, and three robust steel springs for a controlled, responsive bounce—with two small and two large classic River Stones. The mix of stable and bouncing surfaces lets children alternate between firm steps and bouncy landings, encouraging continuous ankle and leg adjustments that develop balance, coordination, and proprioceptive awareness. Use the set on its own to create varied stepping paths and obstacle courses, or combine it with Hilltops and additional River Stones for even more play and training possibilities.