If the fact that Zumba is scientifically proven to make you feel happier [1] hasn't won you over, maybe this incredible weight-loss transformation [2] will. After being told her cholesterol was too high and being denied life insurance, Alena Shifrin decided that she needed to make a change. She walked into a Zumba class one day at 300 pounds — now at 155 pounds lighter, her life has completely changed. Watch Alena's inspiring story above!