You gotta exercise man.
And if you're having problems motivating yourself... read a book about evolutionary biology. Like "Restless Creatures: The Story of Life in 10 Movements" or "Sperm Wars", etc.
Humans are an extremely outdated species. Thousands or millions of years ago how do you think we spent most of our time? According to many scientists we started in the trees. Swinging around like monkeys. And regardless of whether or not you believe that we know at some point we went from walking on 4 legs to walking on 2. Then after that we became great runners.
If you just learn the geometry of how humans walk there's so much to be said about it (compared to other animals). We have the "laziest" walk you can imagine. By lazy, when we walk we're literally just falling over and over again. Except we put 1 leg forward. And our hands & legs swing like a pendulum so we can exert the LEAST amount of energy possible while walking or running.
Why do you think we got like this? It's because we spent that much time running & traveling long distances. The fact that we can stand up on 2 legs also insulates us from reflective heat on the ground. There are so many amazing facts about how we're designed that SCREAM how unnatural it is for us to NOT be running or walking. That's why I run the fuck out of my dog 6 days / week. She's 30lbs but runs on avg 3 miles / day.
Early in the day before we both go for a run it's hilarious how we act. She can't fucking sit still. She gets up, walks in circles, sits down. Gets up, scratches the rug, sits down. Gets up, runs to a window, sits down. Jumps on me, sits down. She'll do this every other minute all day long if I don't run her. If I'm checking email when I wake up I'm shaking the shit out of my legs, moving nonstop... I can't stop fucking fidgeting or moving limbs, fingers, toes, etc. Our bodies do this shit for a reason. There are days I'll literally start trembling that's how bad it gets. The homoerectus in me is shouting GET THE FUCK UP AND RUN.
So that's what I do. I run my ass off. I run my dogs ass off. It only takes 3-4 weeks for your body to get conditioned. After just 2 weeks your feet, legs, shoulders and back will stop getting sore. The lactic acid burn goes away. Then you'll find yourself sprinting like a cheetah at speeds you had no idea were possible.
People talk about this "runners high" shit but I run cause I NEED to feel like an animal. I need to remind myself every day I'm ANIMAL. I'm not a fucking robot. My dogs not a robot. My 10 year old piranhas aren't robots. I feed those fuckers 1/2lb of fish every week. There's no sane reason or need to have other live fish in the tank with those kunts. But STILL, I always keep live fish in the tank. Every so often I know they're gonna get the murderous compulsion to kill and be the kunts they are. And they always have to kill the biggest goldfish in the tank. They never actually eat the fish. They just tear it to pieces then I gotta clean the mess up. I had 1 goldfish going almost a year he's been in that tank with those kunts. And there's dozens of smaller goldfish. It always happens where 1 goldfish grows fast as fuck. 10xs quicker than the piranhas. Then he gets around 5-6" (like half the size the kunts) and I get so excited. I'll think "MAYBE their friends now? MAYBE they won't kill him like the last 100 biggest goldfish in the tank? MAYBE I'll be the 1st person in the world to own 2 noncoexisting... coexisting species? MAYBE once that goldfish passes half the size they won't kill him cause they're scared? MAYBE they are robots afterall???"
Then I wake up, look at the tank and see a giant goldfish head floating in the trees. And his tail on the other side of the tank.
I'm not sure what the moral of this post is. I just know that we're all animals. We all have instincts. To deprive that inner animal what you know it needs... you might as well just put a bullet in its head.