Carina A. Ortiz Toro, 35, says she is shy and has been her entire life. So how did she end up on stage leading Zumba classes as the only wheelchair-using instructor in the Caribbean? “In 2013, I went to a gym for the first time as an adult and started training and participating in the group Zumba classes,” says Ortiz Toro, who has spina bifida and lives in