I wish I could get my son to exercise twice a day. He hates going outside. He prefers his exercise running around in Minecraft, and if he does get it in real life, it's jumping around the living room.
Be a parent. Set rules and consequences. Outside time or no Minecraft seems like a no brainer. Interact and get him to join you in things you like doing outside. He’ll probably hate it for 1 month or 1 year, but it’s your responsibility.
If you're involved as a parent, sure. Just for the love of god do not just throw your kid outside saying "play outside", because that sucks. I'm speaking from experience.
Things I like doing outside? I'm afraid that's a very short list. I totally understand where he's coming from.
We do set rules, it's just that we don't always maintain them very strictly, and he loves to bend them. And when he does play outside to get more Minecraft time, he thinks 15 minutes outside it enough.
It seems he just has no idea what to do outside. As a kid, I regularly played outside, probably because I had to, and so did the other kids in the neighbourhood, so we played outside. But none of his friends plays outside, so there's nothing to do for him outside.
What doesn't help is that we live in a city: no backyard, no fields or forests behind the house, and watch when you cross the street. Plenty of playgrounds fortunately, but the youngest, who loves to play outside, is just 5, which is a bit young to be outside on his own, so he's learning to adapt to indoor play. Maybe playing outside is getting trained out of kids because of the environment we live in.
Ah yes, your city environment will make it more difficult. That said, if he's old enough to bike (and the city you live in has some bike safe areas) then that's a great hobby to push. Taking 30 minute walks around the neighborhood is another. Regularly going outdoors (taking a walk together, visiting parks, any local state parks) as a family helps. But yea, if you're not doing it it's not going to transfer well to your kids.
Regarding setting rules: Kids are very bright when it comes to getting their way. If there's any loopholes they'll exploit them. If they detect weakness in resolve then they'll push and push using negotiation, guilt, deception, etc... The question they're trying to figure out is, is my parent in charge or can I be? The hardest but best thing you can do as a parent to instill disciple is to be clear, consistent, and follow-through. It's really hard. I'm in the midst of it too!