Step aerobic classes are at present one of the most popular forms of e
xercise undertaken by young adults. To date no dermatological abnormal
ities have been described in people regularly performing step aerobics
. We describe a case in which a healthy young woman developed an exten
sive pigmented purpuric eruption 4 weeks after commencing regular step
aerobic classes. The eruption resolved completely 8 weeks after regul
ar exercise was ceased.