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This is a general apnea workout, designed for newer divers, training in a 'short course' or 25 yard pool. 25 yards is a common length for community lap swim and health club pools in the USA. These are often advertised as 'Olympic sized' (serious marketing spin--it's been nearly 100 years since the Olympics switched to 50 meter pools!) Some lap pools may also be 25 meters instead of yards, but this is less common in the USA. If the notation style is unfamiliar to you, pleas