The Indirect Measurement of Active Drag (IMAD) was used to study the contribution of the legs and arms to propulsion in breaststroke swimming. Contrary to MAD (Measuring of Active Drag) system, the IMAD can be used for all strokes and therefore enabled us to study the breaststroke swim to estimate not only the percentage of leg and arm contribution to propulsion but also the percentage of swimmers’ arms and legs co- ordinations. The method revealed that the best coordination was 84.02 % and that the contribution of arms and legs in propulsive force were 43.80% and 56.20% respectively, showing that the swimmers received leg contribution better than arm contribution in propelling.
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