Breast size can affect how women exercise and whether they decide to work out at all, according to a large-scale new study of the exercise habits of women of all ages. The study suggests that physical concerns, including breast size and bra fit, should be openly and frankly discussed during considerations of what keeps people from being active.

Nobody doubts at this point that exercise can improve our health, happiness and longevity. But a hefty percentage of adults across the globe rarely if ever move.

The reasons so many people remain so sedentary are numerous and complex, studies show, ranging from jammed schedules to unwalkable neighborhoods. But another common obstacle, according to survey responses, is discomfort during exercise.

For many women, that discomfort involves their chests. Female breast tissue is heavy and unsupported, containing little stabilizing, connective tissue. So, breasts move when women exercise, even if they wear a bra.