FLOWERY BRANCH – There is a lot to like about the Atlanta Falcons ’ third-round pick, Zachariah Branch.  The former Georgia wide receiver offers elite speed and playmaking ability that make him a tantalizing candidate for Kevin Stefanski’s offensive plans this season. Plenty has been said about his versatility, but he has one hidden trait that could help him quickly adjust to life in the NFL.  His father, Sheva Branch, is a strength and conditioning coach who has worked with world-class athletes like Serena Williams. That experience has done wonders for his son, whose strength has quietly been one of his primary assets.  The emphasis on weight training, getting proper sleep, and taking care of his body – he retains an oxygen therapist who helps him with his recovery and conditioning – has been there from the beginning.…