About the training zone and percentages for clients
You have just completed VO2 testing for your new client. Your client has displayed an anterior pelvic tilt during previous assessments. Based on their score, according to NASM, they are categorized as “Fair”.
Based on this category: What heart rate/training zone should they be working in (provide percentages)? In what stage of training will you place your client?
Because of the estimation of a "fair" level of cardiovascular fitness, I recommend that the client do intervals up to the HR at threshold, then slow down to 20-25 bpm lower the the threshold HR, then speed up to threshold HR. So, rather than using percentages, I would use HR values based on he VO2 assessment. If the fitness level is fair, then the client is in the early stages of training. To measure improvement, periodically repeat exactly the same testing protocal initially used, and determine the HR at threshold. If you're using a treadmill, you can determine changes in speed and/or grade at which the threshold HR is reached.
If there is anterior pelvic tilt, include in the client's training programs exercises that resist posterior tilt, such as supine reverse trunk curls, the hips flexed at a constant 90 degrees.
Daniel has a great response however, I also do not use this approach.
I simply use the formula for MHR at stay in the range of 60% to 80% of MHR. And always, I monitor my client/s in session.