What does the phrase and fitness effect and refer to?

How does optimal foraging improve an individual's overall fitness? Which one burns more calories walking riding or skipping? How do you know what percentage of weight lost is actual fat instead of muscle or water especially if you are weight-training? Why do your knees pop when you bend or sometimes while walking? Where is the main office of bench? Is it bad to wear a push up bra under a sports bra? How can I properly perform an elevated cable row exercise to target my upper back muscles effectively? Do you need rest days from push ups if you are 14 and you want to improve fast? Is spandex stretchy? Can you defecate while doing a headstand? Can you shrink to a small size? What benefits come along with having a folding treadmill as opposed to a permanent one? What is messi's weight? Why is skipping class wrong? What meal provide the most energy and includes the material needed to build muscle? Is Creatine good for muscle building and Is it worth it? What do dumbbells work out? What are the benefits of fitted shirts over standard? What is the recommended exercise ball size for sitting to promote proper posture and improve core strength? What are the benefits of using a step workout bench for improving fitness and strength training?