Are you not "living" because you don't do sports?
I'm seem to think that when I see people who do sports as a career or as a hobby or famous people who do those things, it makes me feel as though they are "making the most" of the energy they have and "living" whereas I didn't want to career in that field and instead been doing reading and writing as a hobby. To me for some reason it feels as though it's not "living" to me which I know sounds ridiculous but that's how it feels to me.
I used to like playing sports at school like basketball, trampolining, football, swimming and running but again I didn't take it up as a career or hobby and I still don't really want to now even I do still like swimming but I won't go on my own unlike it I did as a kid when my dad used to take me and my sister swimming on the weekends.
If you're not dead, then you are alive. You are living.
Nobody is going to come out of the wood works and give you a grade or a stern talking to regarding whether you're living the right or wrong way. Frankly we're all busy fretting about ourselves. Life isn't a pass / fail system. You simply exist because you exist.
What you do with yourself is up to you. So, ask yourself, do you want to do more exercise or get into sports? Maybe you don't know. That's valid. You could always give it a go. Don't have to stick with it.
By the sounds of it, maybe you want to do these things but don't want to do them alone? Is that the conflict? You'd rather do these activities with others? I can understand that.
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Support human artists!
Near the spectrum but not on it.
I think you're right that sports/exercise is making the most of one's energy, but to not exercise doesn't necessarily mean you're not making the most of your energy especially if you're directing it to more intellectual pursuits.
However there is a balance to be made, and exercise has been shown to bring benefits to our mental health as well as physical - the brain is as much a physical organ as any other, if exercise improves the cardiovascular system that's of course going to benefit the brain.
I've done both, my late teens up until my mid 30s I was more focused on learning (in the broadest possible sense of the word), but I've gradually become more focused on my physical side since.
