Is there good, accessible science (not the opinion of an "expert") about - What kind of exercise is good for what (e.g. short intense or long light)? - How qu

Is there good, accessible science (not the opinion of an "expert") about - What kind of exercise is good for what (e.g. short intense or long light)? - How quickly does performance increase? What causes better performance? - Why and how quickly does muscle tissue form? - Does lung volume increase? - What happens to your heart? - What happens to your veins? - How much exercise? - How does eating affect exercise? E.g. if you are losing weight, will your body still make roughly as much new muscle tissue? - Why is it that I get sore more quickly and run more slowly when I haven't eaten enough, even in the first few minutes of running when all the energy is still coming from stuff stored in muscles? I think the answers to these questions would be very valuable to individuals as well as society as a whole.