It's well known what Fitness means right? Fitness has been Cut aka being Defined, aka Getting in shape aka Getting Shredded aka Getting Jacked aka Getting Ripped (not in a drunken sense).

Fitness
Fitness, as something that we have to shoot for physically to improve the visual look of ours, and by virtue our inner functions and overall health, is a relatively recent idea. Here in the United States, circa the 17th-19th centuries, our country was an agricultural country, with the vast majority of its residents involved in farming. Most everyone worked really hard on the farms, and thus most everyone was in shape or fit in some way or another.
The fairly recent societal technical innovations have served to help make us a culture where convenience and expedience is the norm; the rapid advancements and rise of technology in addition have resulted in an explosion of public migrations from the farming heart lands to the cities of ours, changing them as well as triggering a consequent rise much of what we realize of today like concentration of humanity and wealth in centralized hubs of wealth and industry and in effect, business tasks where we try sitting close to every day looking at a computer monitor (and smartphone/tablet screens). This has cause increasingly more of our citizens starting to be significantly less match, thanks in large part to the sedentary nature of the work of ours and the home lives of ours.
Consequently, we today have a majority of our citizenry that's out of shape without at all fit by any person's definition. As a direct result of this, a necessity for an industry to meet up with the demands of our out of shape and fat citizens was created and continues to adapt as well as flourish. This is of course out of necessity - our population is aging, our children are more and more using shape, and their parents are obese.
These days, when we see somebody who is in shape or fit, we marvel at them, mainly since they are even more the exception than the rule. As you can observe, the notion which everyone starts off healthy and in top condition, as could have been the case at least a century ago, is contrary to the majority that is today.

Old Rules of Fitness Our old "modern" rules of fitness would have you merely eat less and exercise to achieve a semblance of health, and at the very least a modicum of weight loss. The mantra will be eating 3-5 meals per day, exercise at least 1-2 hours each day, performing 3 sets of 12-15 repetitions in some kind of excess best weight loss pill for high blood pressure for individual muscle groups. Very formulaic, generic, and ineffective. The old rules were not bad - they only were far too generalized and accomplished only the basics. They were decent tips to form a foundational comprehension of work out and offered an easy glimpse as to the task it takes to attain a specific standard of fitness. Not an awful start - That was then.

The new Rules of Fitness Welcome to the new rules of fitness, in which there's a focus on achieving optimum results as efficiently as possible. There is much less focus on "general standards" for sets and repetitions along with a much better focus on intensity and duration, as well as the incorporation of many powerful modes of physical exercise including plyometrics, dancing, resistance training, pilates, yoga, and also other aerobic as well as anaerobic modes that can be utilized & blended to market optimum muscular recruitment in effect causing more power to be used in a more small time frame. This's a much more effective and efficient way of getting things done. Indeed we're in a golden age of creation and achievement as it pertains to creation and adaption of exercising systems for fitness. Everyone who's embracing this movement should be applauded.
Now is an era where P90x, Insanity, along with various other similar sort of physical fitness techniques are being attempted and embraced on a large scale. Precisely why is this? There really is not only one simple reason - it's since they're dynamic, fun, and most of all these methods produce results - and not simply regular outcomes, timely, effective outcomes.