It's not a big problem. It doesn't matter if energetic young people don't rest. Although I am now a second-class disabled person after a car accident, I always do some exercise before taking a shower every day. Because I have become a habit and kept it for more than ten years, I am stronger. Rest "varies from person to person". There is no absolute answer. Just like I still take a cold shower, I don't think there is anything wrong with myself, and others don't believe me. (except for contacts.