Plantar Fasciitis is commonly caused by hip or hamstring weakness and not the foot. It is a bit complicated to explain, but just know calf stretches are not usuallly the fix.
Back pain is most commonly caused by tightness in the hip flexors, specifically the psoas.
The psoas is one of the most complicated muscles in the body and is linked to our stress. High stress increases cortisol and causes it to tighten. It is a fight or flight response.
Greens are key to detoxing. The more you eat, the more you will detox. 5 servings of greens is ideal for detoxing.
Most people don't walk correctly. Why? We wear shoes. Seriously the worst invention ever! You must be able to strike with the heel and transfer the weight through the foot then roll off the toes. You should feel your calf and butt contract as the leg you're standing on goes behind you. Shoes often are too rigid to allow this. Put a block of wood on the bottom of your foot. How well would you be able to do this? Are you shoes preventing it as well?
If you want to start improving your health today, there is one very simple thing you can do. Drink more water. How much? Half your body weight in ounces up to 100 ounces. For example, if you weigh 150 pounds, you should drink 75 ounces. If you weigh 300 pounds, you should drink 100.
Stretching, as most people do it, is very uneffective. Even many coaches, chiropractors, physical therapists and other "stretchers" are not providing the most up to date and effective methods. Stretching is a true science.