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In this November 16, 2011 free audio episode: Is aerobic training bad for you?, how to measure body fat accurately, how to use an elliptical trainer properly, aloe vera juice, high protein diets and headaches, electronic bike shifters, and training for a hard hike.

Remember, if you have any trouble listening, downloading, or transferring to your mp3 player just e-mail ben@bengreenfieldfitness.com And don't forget to leave the podcast a ranking in iTunes - it only takes 2 minutes of your time and helps grow our healthy community! Just click here to go to our iTunes page and leave feedback.

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Special Announcements: -May 27-June 3: All-Inclusive Kona 2012 Triathlon Camp! Ben Greenfield will be there for a week of swimming, biking and running on the famous Ironman Hawaii course, along with IM Talk host John Newsom and Ironman World Champion Scott Molina. This Epic Camp culminates with the Ironman 70.3 Hawaii race! Space is limited, so act soon - click here to get full info or to register now for the Kona camp.

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Featured Topic: How To Easily Measure Your Body Fat With Laser Accuracy

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The BodyMetrix System uses ultrasound to accurately measure fat thickness and calculate Body Fat % and weight distribution, and in this interview, Ben speaks with the inventor of the BodyMetrix System, Luiz Da Silva.

You'll learn how to easily measure your body fat with laser accuracy, what a device costs, how to use ultrasound to measure body fat, and much more!

Earnings disclosure: Ben Greenfield makes commission on sales of the BodyMetrix System.

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Listener Q&A:

Raminta has a call-in question about the many negatives of aerobic training, and this article:

http://www.charlespoliquin.com/ArticlesMultimedia/Articles/Article/728/The_(Many)_Negatives_of_Aerobic_Training.aspx

Jeff asks: Is a 3 mile "run" on an elliptical machine the fitness equivalent of a 3 mile standard run? For example, say my training plan calls for a 5 mile run (which would typically take me about 40 minutes), would a 40 minute ellipitcal workout be comparable? Also on an elliptical trainer, should I try to replicate my running gait and foot strike as much as possible? I'm more of a heel striker, but find myself using my forefoot more on an elliptical machine.

In my response to Jeff, I mention the Elliptigo.

Scott asks: Based on your advice, I've eliminated artificial sweeteners completely from my diet and am trying to eat more protein in particular.  I've paid particular attention to the quality and source of the protein, but this hasn't always been easy and the quality of the source has often been uncertain (I travel extensively for business). Recently, I have developed some bad headaches.  Sometimes they seem to spike right after eating.  During initial, heavy exertion when lifting weights can also cause a spike in pain.  But mostly, I walk around all day with a dull headache. Could this be due to my high level of protein consumption?  Low level of carbohydrate consumption?  Detox from artificial sweeteners and sugar?  Other thoughts on what could be causing these headaches?

Jennifer asks: I recently read in a book that a study found that drinking aloe vera juice could help relieve asthma symptoms.  The study was not cited.  Have you ever heard of aloe vera juice relieving asthma?

In my response to Jennifer, I mention this Aloe Vera juice I use.

Robert has a call-in question about Shimano DI2 shifting and whether I recommend it.

Brian has a call-in question: I have a fitness question about racing the Grand Canyon rim-to-rim-to-rim. This a 45-mile run/hike from one end of the canyon to the other and back. A handful of us plan to "race" it this coming Spring...meaning that we're going to do it as fast as we can. We're debating the best training plan. My belief is that we ought to spend two-thirds of our training time doing crossfit/plyometric-style workouts to strengthen our legs/quads/gluts/core as well as to develop more flexibility in our hips/IT band and then spend the remaining one-third doing long runs. My training buddies, on the other hand, are of the opposite belief... they believe we should spend two-thirds of our training time doing long distance runs and one-third doing crossfit/plyo type of training. In short, I believe strength/flexibility/agility are more important than long distance training. As background, we are all marathoners and we have all been doing crossfit/plyo training for the past five years, so we have a solid training base. This debate really is about how to spend the next five months leading up to our event... should we spend it mostly doing long runs or mostly focusing on weights/core/plyometrics/flexibility.

Patrick has call-in feedback about http://www.TriathlonDominator.com

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Remember, if you have any trouble listening, downloading, or transferring to your mp3 player just e-mail ben@bengreenfieldfitness.com And don't forget to leave the podcast a ranking in iTunes - it only takes 2 minutes of your time and helps grow our healthy community! Just click here to go to our iTunes page and leave feedback.

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