Answer:
1)Diets that focus on only a few foods or food groups.
2)"Detox" diet.
3)Diets with 'miracle' foods or ingredients
<span>Heart Rate Reserve, HRR. Heart rate reserve (HRR) is the difference between resting heart rate (HR<span>rest) and maximum heart rate</span> (HRmax). Heart rate reserve is used when determining exercise heart rates. The Karvonen formula is used to calculate exercise heart rate at a given percentage training intensity.</span>