On today’s show, what you need to know about the updated booster shots and why they matter amid growing pandemic fatigue. Plus, new research on the science of sitting and the pitfalls of being an “active couch potato.” Read more:The new coronavirus vaccine boosters are now widely available in the United States, but the updated shots are rolling out amid widespread pandemic fatigue. Federal health officials say that these updated vaccines could help buffer communities against future surges of the virus. Earlier this month, officials announced plans of turning coronavirus shots into an annual dose, similar to the flu shot.  Today on Post Reports, health reporter Lena H. Sun, who’s followed the coronavirus pandemic from the beginning, answers some of the most pressing questions about the omicron-targeted boosters. Plus, The Washington Post’s newest wellness columnist, Gretchen Reynolds, on why exercising the recommended 30 minutes a day might not be enough if you are an “active couch potato.”