The indoor swimming pool isn't really big, about 25 * 10 m? But it's already much better than that fishbowl at gym, and it only costs 3 Euro. With a prepaid card you can even get extra discount.
And everything there works in a very very German way: You need a coin for the locker, and it must be a 2 EUR coin. Hair dryer will go off automatically, you need to press a button on the wall to make it work again. I learned this from a kid when I was switching the hair dryer on and off desperately. read more