Push-ups are great for upper body strength.
High concentrations of carbon monoxide kill in less than five minutes. At low concentrations it will require a longer period of time to affect the body. Exceeding the EPA concentration of 9 ppm for more than 8 hours is suspected to produce adverse health affects in persons at risk.
This can be reasonable to ask of a person taking the program but we are humans and our diets don’t necessarily go off a program that we take because some days people might eat better then other. All depends on what that person likes, the time they have to make or get food and the expense of it
