Both sides up! Use either the curved or flat side of this multifunctional core training device to integrate balance into every aspect of fitness, sports performance, or rehabilitation. The BOSUŽ Balance Trainer adds versatility and challenge to an incredible range of activities: cardio, strength training, athletic and sport conditioning, core training, and mind/body workouts. Combine it with other equipment to add new, exciting elements to existing training regimens. Professional grade BOSU Balance Trainers! Extremely durable for use in facilities or personal training. Supports up to 300 lbs. Commercial warranty on defects. Includes air pump and exercise manual. Dark blue with black base. 25" diam. 15 lbs.