A basin includes a basin body that can house a device for athletic activities for executing physical exercises in an aquatic environment. The device for athletic activities includes a frame that can be removably housed in the basin body. With the basin body including at least two opposite walls, at least one of the opposite walls defines a wall extension forming a projection into the basin body, with the free end of the wall extension including a device for receiving/holding one end of the frame. The frame includes a cassette that can move in translation along an axis of displacement and a drive system for moving the cassette along the axis of displacement. The cassette includes a body, with the cassette body being provided with at least one hole that laterally passes through the cassette body for accommodating a pedal system making it possible to perform physical exercises.
