Joan MacDonald is the Instagram Wonder Woman who, in her 70’s, overweight and taking numerous medications, began a journey to fitness and health and invited others to follow along. She knew nothing about social media but today has 1.4 million followers – and I’m one of them. Photo: Women's Health Magazine Every image on @trainwithJoan shows her smiling. No wonder! Transforming her health as she did would make anyone smile. She's no longer taking medications for high blood pr