To elaborate on your comment: part of the challenge is that without professional assistance, it can be difficult for the average person to develop a fitness pla

To elaborate on your comment: part of the challenge is that without professional assistance, it can be difficult for the average person to develop a fitness plan that will produce meaningful results in a safe fashion. Lots of people are limited by existing injuries, and others create injury by jumping in and pushing themselves too hard too fast. Another challenge is that true fitness requires you to push yourself in different ways. Far too many people work out in a one-dimensional fashion. It's easy to jump on a treadmill or do the same free weight exercises day in and day out. But there are real limits to what most people can achieve without a well-rounded plan. One-dimensional workouts are why, for instance, you have guys walking around with impressive biceps, pot belly stomachs and chicken legs, and who can't do 10 minutes of moderate intensity steady state cardio without huffing and puffing.