This term seems to refer to an activity or a form of leisure that involves appreciating or critically analyzing the experience of swimming in an outdoor swimming pool during the afternoon. Outdoor swimming pools are common in many places, especially during the warmer months, and they can offer both physical exercise and a relaxing social activity. The 'appreciation' aspect might involve enjoying the natural surroundings, the ambiance, the health benefits, or the cultural significance of outdoor swimming. It could also involve a more detailed analysis of the design of the pool, the facilities, and the overall experience.