Alison Phillips, an associate professor of psychology at Iowa State University, grew so, so tired of using the elliptical machine in her home, day after day, for over a year during the pandemic. First off, the repetition was aching her feet. But even worse, it hurt her mind. “It’s boring,” says Phillips. “Same thing, all the time.” So two weeks to the day after Phillips received her second COVID-19 vaccine shot, she returned to her local gym. “I needed the variety of activities,” says Phillips. “For not just my feet, but for interest sake.”