Aktiv AQUA products create a unique stabilization challenge during functional movement. Reactionary forces improve power and strength to offer versatility for balance, coordination, posture, and sports-specific training. Extremely durable and waterproof for easy cleaning, they are ideal for outdoor and boot camp style training. Available in four shapes & sizes to create unlimited levels of beginner to advanced instability training. Aktiv AQUA products add an entirely new dimension to all workout programs. Every Aktiv AQUA order will include a Filling Attachment to be used in combination with the Aktiv AQUA Foot Pump.