I was asked recently where the 'Endless Swimmer', was, that I love and have spend many wonderful weeks each year swimming in.
It is the rapids pool at the lower end of the Katherine Hot Springs in the Northern Territory of Australia.
Reg and I usually stay at one of the Family Friendly Parks, the Riverside Caravan Park is at the top of the rise above the Katherine River and the Katherine Hot Springs. The water is actually warm here, not hot. Very pleasant for exercising :-).