Exactly! Weight lifting is a good simplified way of explaining it. You lift weights, your muscle breaks down and causes inflammation and feels sore, your body a

Exactly! Weight lifting is a good simplified way of explaining it. You lift weights, your muscle breaks down and causes inflammation and feels sore, your body as a result signals to repair and rebuild itself. Over time your muscle becomes conditioned to that particular exercise and weight amount. You will then be able to perform that exercise, at that weight easier without the same level of muscle breakdown, soreness or inflammation. Same with running, with enough training you will be able to run that 5k at a time you would have been exhausted at months ago. Through enduring the constant repair and build cycle that inflammation flags from muscular and cardiovascular fatigue. It is why so much emphasis is placed on what you do outside of exercise during recovery, than the effort itself. This is all purely in the context of exercise and not other forms of inflammation which the article also covers.