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As the joints are flexed, more oil is produced, reducing the risk of sprains. Every part of the body becomes better irrigated, stimulated, and more fit for training.

Preparatory exercises consist of general warming-up and loosening-up exercises as well as exercises more specific to karatedo. They may be performed either alone or with a partner. They should be neither too strenuous, to avoid any useless fatigue, nor too lax, in which case they are worthless. They should range from 5 to 10 minutes for an hour of karatedo practice and from 10 to 15 minutes for a two-hour practice.

All the preparatory exercises fall into one of the following categories: jumping, stretching, bending, twisting, and circling. They should be performed in a sequence starting with the extremities of the body and proceeding gradually towards the heart. Thus one should start with exercises for the legs (toes, ankles, and knees), then hips, trunk, shoulders, arms (elbows, wrists, and fingers), and finally the neck.