Matt Schiffman has worked out for as long as he can remember. A 36-year-old resident of Miami and vice president of Brand Management for RSP Nutrition, Schiffman says sports always played an integral part in his life. But despite playing multiple team sports during childhood and staying active throughout his life, Schiffman gained weight steadily. The pounds kept piling on until he finally found a way to stop the gain and turn it around—thanks to the keto diet.