Personalized Aerobics Instructor Worlds Best Baby Bodysuit. Blue and tan occupation design says Worlds Best Aerobics Instructor on this Baby Bodysuit - White & Heather w/ Ears gift for the fitness teacher or coach. Our unisex one piece baby bodysuit make great gift for newborns, babies, infants, baby showers and expectant moms. An ideal gift for any new parent who will want one in every color.