Chris Hemsworth has warned fans making huge lifestyle changes for New Year won’t be “sustainable”. The 40-year-old actor and fitness fanatic – who recently launched his Centr exercise app – made the declaration as he urged his fans in an online video to make one “small” change every week in January so they wouldn’t end up feeling overwhelmed by trying to stick to their 2024 resolutions. He said in an Instagram video: “Happy New Year everyone. As I sit here starting 2024 with my family and friends, it really got me thinking about the ‘New Year, New Me’ mentality that makes the rounds on social …