Hi there, have you tried swimming. The water makes you weightless so it might not hurt your back, you could also do gentle yoga to perhaps help your back, but check with your doc or consult a yoga teacher who could help you find movement to get you more limber. Good luck.
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 links are http://www.youtube.com/watch?v=zy7j9FRiJpg&list=PL9FxWnfq1Oyo9pHHUPHeQne4iqoZ4zTN_
https://www.youtube.com/watch?v=BT5hRYXmxSE&list=PL9FxWnfq1Oyo9pHHUPHeQne4iqoZ4zTN_
https://www.youtube.com/watch?v=XLKML9EL4As&list=PL9FxWnfq1Oyo9pHHUPHeQne4iqoZ4zTN_
Figure your heart rate 220 minus your age 51 is 169 that is your maximum heart rate! You should work your way up to 65%-85% of your max. That would be 109 - 143 heart rate
You burn 30 percent more fat from doing cardio after a weights session as opposed to cardio on its own.
Check with your doctor first!!