Standard straight steps
With a concrete swimming pool, a set of steps is usually built into the pool. The standard model consists of a straight set of steps in one of the corners. The steps are kept to a minimum so as to lose as little swimming space as possible.
Classic round corner steps
Round corner steps are classic swimming pool steps that are also built into one of the corners of the pool.
Roman swimming pool steps used to be really trendy, although the popularity of this model has waned in recent years. Roman steps are built outside the rectangle so as to maximise the swimming space.