Alyssa Gialamas swam in the 2012 and 2016 Olympics. But unlike freestyle superstar Katie Ledecky, who won her the 14th Olympic medal of her career at the Paris games this summer, Gialamas is not a household name. Gialamas’s 21 American records in the pool, though, are nothing to sneeze at. She’s a paralympic sensation who has a joint condition called arthrogryposis and uses long-leg braces to walk. She took up swimming at age 3 for physical therapy and in high school in Illin