On a Cellular Level, How Does Exercise Make Us Healthy or Improve Our Health?
bundt_chi: When your body is just sitting around, there’s still a lot of stuff your body is doing. When you exercise, your body has to be able to do those normal sitting-around things better and faster to be able to keep up with the demands of exercising. If you do that enough times, your body realizes it’s not doing a great job and needs to get better. It sends the signal to your body to start improving things. As this happens and your body gets a lot of practice operating at a higher level. In general, your body is less stressed just sitting around because it’s so much easier. [see the rest of this answer here]