Since different events have different requirements, each swimmer has certain physical needs. He does this by over-distance swimming with short rest intervals. He does this by sprinting with high-quality repetition sets.
Every coach trains Imers differently by placing more emphasis on some strokes and less on others.
These are the individual events in competitive swimming. The different colored type corresponds to the quality of training that event requires. Refer to descriptions above. James E. Competitive Swimming Manual for Coaches and Swimmers .