'Katie Kasten of On Beat Fitness walks you through a killer arm and core workout on the BOSU® Balance Trainer.  Follow On Beat Fitness: https://www.instagram.com/onbeatfit/  Follow Us: Facebook: https://www.facebook.com/BOSU.Official/ Instagram: https://www.instagram.com/bosu_fitness/  Twitter: https://twitter.com/bosufitness  #BOSUworkout #bosu #bosuball' 

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