Just buy a yoga mat and start doing press-ups / sit-ups / dips etc
No, don't. Seriously. If you want a long term routine to build strength and stay healthy (which is what we're talking about here), you can't just say "do exclusively upper body pressing for the rest of your life". Floor exercises are great, but none of them work your posterior chain in any meaningful way, which is almost always a weak point just due to modern life of constantly hunching over a keyboard. It's also very difficult to give your legs adequate intensity. It's not impossible, but it's hard.
At a bare minimum you need a bar for pullups. If you want to avoid barbells that's totally fine, but you need a real routine with a clear progression that isn't going to leave you with serious muscle imbalances after a year. https://www.reddit.com/r/bodyweightfitness/ is a good place to start if you really do want to do bodyweight strength training (although even they recommend barbell squats and deadlifts).
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No, don't. Seriously. If you want a long term routine to build strength and stay healthy (which is what we're talking about here), you can't just say "do exclusively upper body pressing for the rest of your life". Floor exercises are great, but none of them work your posterior chain in any meaningful way, which is almost always a weak point just due to modern life of constantly hunching over a keyboard. It's also very difficult to give your legs adequate intensity. It's not impossible, but it's hard.
At a bare minimum you need a bar for pullups. If you want to avoid barbells that's totally fine, but you need a real routine with a clear progression that isn't going to leave you with serious muscle imbalances after a year. https://www.reddit.com/r/bodyweightfitness/ is a good place to start if you really do want to do bodyweight strength training (although even they recommend barbell squats and deadlifts).