Masters swimming twins, Mary and Sara Holman, 31, show one of their favorite swim workouts, the "Melvin." These FastTwitchGrandma twins were 2nd and 3rd in the 800m freestyle 3000m open swim at the 2015 FINA World Masters Championships. Watch this video to learn more about their workout. For more details visit now at: https://www.youtube.com/watch?v=gJ657P_Fh2k