This document discusses the history and differences between aerobics and Zumba. It explains that aerobics was developed in the 1970s as an aerobic dance routine set to popular music of the time. Zumba was created in the 1990s when an instructor improvised a dance workout after forgetting his aerobics music. The main difference is that Zumba incorporates various Latin dances like salsa and samba, making it more fun and easier for people of varying abilities, while aerobics focuses more on strength and endurance. Overall, Zumba tends to burn more calories per session but aerobics is better for muscle training.