bigears,
your article shows my point more eloquently than I ever could, thanks so much. I've got to show that to some of my female friends that are battling their weight problems, but won't listen to me because I'm not a "certified fitness expert" like their trainers at the gym. Maybe an article like this, with results that dramatically different, will maybe get them to start thinking differently.
Here's the bottom line - lean mass (muscle) equals metabolism. More muscle (strenght) means a higher metabolism. Less muscle means lower metabolism. I'll say it again, the problem with aerobic exercise is that it doesn't properly stimulate muscles. Only resistance exercises do that. Thus, only resistance exercises will be able to maintain or increase your metabolism, which is especially important when you are on a calorie deficit eating plan.
Aerobics are very important for cardiovascular health, but they are less important than diet and resistance training for losing weight and looking fit. So, consider resistance exercise as the primary activity that you must, must, must do every week, and you can supplement that with aerobic exercise. But if you are ever going to "miss" a workout, make sure it's the aerobic workout you miss, not the resistance training.
Also, you will never, ever, ever look "toned" or fit if you only do aerobics. In fact I've seen a LOT of people diet and do aerobics as their primary plan, with little or no resistance training, and what always happens is 2 thing - 1, they actually lose muscle because their bodies scavenge the living muscle tissue when they diet, and 2, they lose equal ammount of muscle and fat, so they merely end up looking like smaller versions of their out-of-shape selves. Plus they have to now contend with the fact that their metabolisms slowed down significantly due to the muscle loss, and must exercise all the more, while eating even less. Its a viscous downward spiral. In the end they just can't run or bike or elliptical enough to keep the weight down, and every little think they eat puts weight back on them very easily. When they go back to eating somewhat normally, they put a lot of weight back on very quickly. And now you have the beginnings of yo-yo dieting and weight loss/gain.
Wow, ranted a bit longer than intended. Anyway, this power factor 10 training is actually pretty good, after looking in to it a bit. It covers the 3 areas that are CRITICAL to getting good results with weights:
1. Intensity - you must lift a weight until you reach muscular failure. It is specifically reaching the point of failure which causes a biological response from your nervous system to create muscle.
2. Brevity - Unlike aerobics, MORE IS NOT BETTER with weight lifting. In fact, once you hit failure on an exercise, stop doing it. And don't do it again until your next workout. Once you have stimulated growth, there is no reason to work the muscle again until your next workout.
3. Infrequent - doing an exercise to the point of failure is VERY HARD on your body, and it takes a lot of time for your body to recover. There are 2 stages to recovery that everyone (without exception) will go through - 1st, there is repair. During the repair process you will generally be sore. For most people this will take 1 to 3 days to complete. When you are no longer sore, that means that you are fully "repaired". The 2nd stage is growth, and it takes just as long to complete as the repair phase. So, if you are sore for 2 days, then your growth process will take an additional 2 days. DO NOT WORK OUT WITH WEIGHTS AGAIN UNTIL THIS ENTIRE PROCESS IS COMPLETED. Some people will say 'yeah, but I worked out my chest yesterday, surely I can work out my legs today, since they are different muscle groups. THIS IS FALSE AND SPURIOUS LOGIC. The repair and recovery process is systemic, not localized. Your body has very limited resources to do the repair and growth process. If you work out again REGARDLESS OF THE MUSCLE GROUP, you will short circuit this process and you WILL NOT GROW, or at least not grow as much as you might have.
Besides, this way you spend less time in the gym for better results. And who doesn't like that idea