Youth Conditioning, Endurance and Strength Training - How Important Is It?

With the onset of obesity and overall lack of physical activity in the current youth population, it has become even more evident to focus on youth conditioning and exercise and its impact on future generations.  Technology, unfortunately, has created a very lazy child, as well as the elimination of most physical education programs in elementary, middle schools, and even some high schools.  Kids these days are just eating way too much, and exercising way too little.  Parents are challenged, given the decision, as to what programs to encourage their children to participate in, that are safe and effective to keeping the youth healthy and vibrant.  With youth conditioning, it needs to be a conscious choice as to more endurance, more strength training, or a balance of the two programs.  How important is it?