Mastering a swimming technique is the ideal combination of swimmers propelling capacity and drag reduction ability. By repeating a similar stroke cycle while travelling along the pool, the swimmer is enabled to repeatedly perceive analogous sensations at each cycle, introduce and compare changes from previous to following cycles and replicate the most efficient for a more skilled interaction with the water. In this process of improving how to `treat the water` for a better performance achievement, swimmers are relying on their internal subjective capacity to feel the water while executing and on the external coach`s advice after execution. Our goal as water sports biomechanists is to offer the best assessment to swimmers and coaches. Many steps had to be done to what is finally presented in this paper. TwinDolly is the last version of an idea that started in 1999 and thought (a) as a tool for objective evaluation of the swimmer`s performance and (b) as a complement to the swimming technique learning process by reporting live or delayed feedback. The system is recording video and instantaneous velocity while swimming. This data can be synchronized and displayed to coach and swimmer at the pool`s edge right after executing in a double screen display. Sonification of intracyclic velocity has recently been implemented to assess while swimming, as resulting velocity is the best performance evaluator. The swimmer will try to accomplish a sound`s pitch, from a change in velocity, by altering the swimming conditions. This variety of feedback in form (coach`s advice, video, velocity curves, calculated performance indicators and speed sonification) and temporality (life and delayed) can be offered separately or simultaneously combined for a more immersive perception and may lead to improve the swimmer`s feeling for the water through experiencing while being evaluated and reported of the resulting performance in a sustained and repeated loop.
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