Initially, swimming will probably promote some level of hypertrophy, as it offers greater resistance than air. As well, I could forsee furthering this level of hypertrophy by using fins. However, there is a definite resistance maximum in swimming. At a certain point (Probably very quickly), gains will cease.
Once you reach this point, swimming will probably not be conducive to gaining muscle mass. If you do short intense bursts of swimming, you can probably negate the downsides. However, like cardio, your body will start to use lean tissue as fuel if you swim for long periods of time.
Furthermore, swimming in cold water will increase the level of subcutaneous body fat on your phyqique. This is your body's way of trying to make sure you stay warm next time you hop in the pool.
I do, however, think swimming is an awesome form of exercise in general. It requires using your entire body as a unit, offers a greater level of resistance than traditional cardio, promotes a high level of conditioning, and there is virtually no impact on one's joints. In this respect, it is one of the safest exercises out there.



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