What I do is no impact aquajogging, suspended in the water wearing an Aquajogger. So it is deep water running, my feet don't touch the ground. The depth to do this in a small pool has been the issue--we are trying to go for the lowest volume of water that we can get so we can keep it about 90 degrees without breaking the bank.So far we've come up with 6,732 gallons as the figure that will work with the right width, length, and depth.
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We have looked at the swim spas, but most are not deep enough. What I do is non impact aqua jogging. Swimex makes them customizable, but they are very, very expensive-the model we looked at would cost over $47,000 and we would have to have a pit dug and lined with concrete as well as tthe other work needed (electrical, etc), so it would almost be like paying twice for a pool.