71-year-old fitness guru Mr Motivator has issued a desperate plea to Britons to keep in shape for the sake of their loved ones. Speaking on GB News, he told Andrew Pierce and Bev Turner that regular, hourly movement is imperative to keeping in shape. Derrick Evans added people are increasingly becoming too sensitive about criticism of their weight. “We have a nation where obesity and diabetes is killing us”, he said. “It is our responsibility to look after our independence and our health. “As we get older, it’s even more critical. That’s why I’m here as an example saying listen, I’m 71 years o…