Present continuous tense: "are still favorites" Using the present continuous tense to express a continuous state, that is, reading and outdoor games are still favorites for many people.
Past participle as an adjective: "old-fashioned relaxation methods" Here, using the past participle "old-fashioned" as an adjective to modify "relaxation methods," adding detail and accuracy to the description.
Present participle as an adjective: "maintaining their popularity" Here, the present participle "maintaining" as an adjective emphasizes that these leisure activities are still maintaining their popularity.