Mumbai, Aug. 23 -- In her latest post on social media, Serena Williams announced that she had lost 31 pounds (or 14 kgs) in an incredible weight loss journey. The former world No.1 tennis star, who won 23 Grand Slam singles titles and is considered one of the greatest players in the sport, retired from the professional tour almost three years ago. The mother of two has kept up a strict fitness regimen, but, she revealed earlier this week, that her recent weight loss was aided by the use of a GLP-1 drug. "I feel great. I feel really good and healthy. I feel light physically and light mentally," Williams, 43, told People Magazine. "I never was able to get to the weight I needed to be no matter what I did, no matter how much I trained. It was ...