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arthritis

I  need to lose at least 75 lbs I have walked about 2miles everyday that I was off from work in the past and lost weight but in the last year I gained it back my question is what kind of exercise can i do that won't hurt my knees or cause anymore damage to it thanx
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trainer*
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As a personal trianer I would get you to see a docter first.
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Speak to your doctor first!
The Peak 8 routine it will quickly raise your heart rate 8 times for very short bursts, with a cooling down period in between. Ideally you’ll be sprinting or cycling full throttle for 30 seconds with a 90 second cool down in between each outburst. 

This is the fastest way to lose fat and build muscle in the body. Peak 8 actually stimulates the growth hormone in the body. I encourage you to visit Dr Mercola’s site to learn more about Peak 8 fitness because I personally feel that it is one of the best ways to exercise, especially considering the speed at which you can lose fat and build muscle. 

I highly recommend you read this article and watch the videos on the page. It will give you all the information you need to know about Peak 8 – Flood Your Body With This “Youth Hormone” In Just 20 Minutes 

What you eat after Peak 8 training does matter 

It’s recommended that you do not eat sugar or carbohydrate for 2 hours after the Peak 8 exercise because these foods can impact the release of the growth hormone in the body.  The link is below 
http://fitness.mercola.com/sites/fitness/archive/2010/11/13/phil-campbell-on-peak-8-exercises.aspx 

Figure your heart rate by this formula 
subtract your age from 220 that is your maximum heart rate! what you want
is to get your heart rate between 65% to 85% of your maximum rate.
A stationary bike is good

You burn 30 percent more fat from doing cardio after a weights session as opposed to cardio on its own.
As I said get the OK from your doctor first!!
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