Source: Tech – South China Morning PostJoan MacDonald’s health was in shambles at age 71. She was overweight and on numerous medications with high cholesterol, rising blood pressure and kidney trouble.Her daughter, a US fitness coach, warned that she’d wind up an invalid if she did not turn things around. She did, hitting the gym for the first time and learning to balance her diet with the help of a brand new tool, an iPhone.Now 75, MacDonald is a hype beast for health with a bodybuilder’s physique and 1.4 million loyal followers on…Read More