The phrase "gets back in shape" indicates a return to a fit and healthy state. Its antonyms, on the other hand, imply the opposite. Words such as "decline," "deteriorate," "weaken," "deteriorate," and "worsen" all represent states of physical or mental decline. Other antonyms of "getting back in shape" like "neglect," "abandon," "disregard," and "ignore" all suggest a lack of attention or care for one's health and wellbeing. Therefore, it's essential to pay attention to these antonyms and strive towards good health and fitness, incorporating proper diet and exercise into daily routines. By doing so, it's possible to avoid negative consequences and enjoy life to the fullest.