Modern gymnasium building, eco-friendly materials, reclaimed wood flooring, bamboo walls, recycled metal beams, low-carbon concrete, green roofs, solar panels, natural ventilation systems, clerestory windows, abundant daylight, soft warm lighting, 3/4 composition, shallow depth of field, realistic textures, ambient occlusion, athletic equipment, basketball hoops, volleyball nets, exercise machines, mirrored walls, motivational quotes, inspirational posters, calm color scheme, earthy tones, wooden accents.