David Davis tells the rather curious history of the sports bra — first devised by sewing two jockstraps together, its conception led to years of conflict between the three company founders.

Human breasts are made up of fat as well as glandular and connective tissue, blood vessels, and lymph nodes. Breasts have no muscle; the Cooper’s ligaments provide support and attach to the chest wall, but do little to reduce movement. During exercise, biomechanics clash with biology: Breasts move up and down, backward and forward, and also side to side, causing severe discomfort.