New Physical Protocol has me stumped/not working.

[Danimal]

I did not read the whole thread, but I did not see running form and flexibility covered. If you are getting shin splints there is a good chance that you overpronate when you walk or have flexibility issues with your calves. Both of these issues can cause bad running form, which slows you down and makes it harder to do the same amount of work. That will elevate your heart rate significantly. For example, if you step too far in front of your center of gravity your foot hitting the ground actually slows you down a little and generates more joint impact force than correct form and requires your other leg to make up the loss of energy.

The good news is that you can have someone evaluate your gait and get a running coach to correct your form. This will get rid of shin splints and if you follow the stretching routines will usually cure lower back pain and other problems.

The bad news is that it sucks to learn how to walk and run different, and it takes a long time (6 months to a year) before it is natural without issue. This is where I am at. It is just finally getting to where I can exercise as hard as I want to without pain.