BOSU was founded in 1999 by David Weck, who created the BOSU Balance Trainer as a versatile tool for fitness enthusiasts and professionals. The name 'BOSU' stands for 'Both Sides Up,' reflecting the unique dual-sided design of the product. Since its launch, BOSU has gained popularity in gyms, fitness studios, and homes around the world, becoming a staple in functional training and rehabilitation programs.