By eHow Sports & Fitness Editor
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Spinning refers to indoor bicycling classes popular in gyms and fitness centers. The term is related to a continual variable speed of bike pedaling. Spinning is a fun and intense workout. Teaching it requires a lot of energy, but little preparation. Certification is not always needed to become an instructor. A popular Spin class has an interesting, challenging routine paired with motivational music and instruction.
eHow Sports & Fitness Editor