The PurAthletics 22" Exercise Ball is designed for optimal performance and durability, holding up to 300lbs. Its 55cm size is perfect for users between 5' to 5'6" in height. The non-slip surface makes it an excellent choice for toning abs, thighs, and improving posture. Use it as a ball chair for active sitting and to relieve back discomfort. The package includes a hand pump, instructional sheet, and a plug remover, along with a free downloadable instructional video available at zenathletics.com.