I donate blood plasma twice a week,
which can burn up to 4000 calories in total!
Also I run 2-3 times a week and do strength training with bodyweight. Calisthenics and a bit of athletic and gymnastics inspired stuff.
Love to use resistance bands as well.
I also take part in local Parkrun events as often as possible.
Update:
Food is a massive factor too, of course.
I don't use processed or separated supplements. I Eat a lot of oats, fruit and vegetables. I eat whole grain bread without flour, which makes a big difference for the digestive system, but also has countless other benefits (it's called Wunderbrot).
I avoid wheat flour products and meat. Anything that's causing inflammation.
I daily use Ashwagandha powder, which is basically a dried and powdered root of the plant. Really good for lowering blood pressure, it also makes me more relaxed and at the same time makes me concentrate, focus better.
Great for sleep probs too.
I also use Moringa, it's really good for everything blood circulatory system related, another wonder plant, that has pretty much no cons.