I actually tweaked this recipe a bit because I needed to use up some sour cream, so I substituted the whole milk yogurt with a 3/4 cup sour cream and 1/4 cup orange yoplait yogurt. Then I used orange zest and orange juice instead of lemon.
In general terms, your THR is 60-80% of your maximum heart rate. The Karvonen Method of calculating THR is one of the most effective methods to determine target heart rate because it takes into account resting heart rate. Ad.
In step one, you found your resting heart rate (RHR). You'll use this number to find your target heart rate zones using the Karvonen formula, a measure of your heart rate reserve. Using this formula, we'll calculate a THR zone between 50% and 85% of your heart rate reserve.