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PI Performance Index - Biggest Loser SlimCoach

A commonly asked question with the Biggest Loser SlimCoach is what the PI, or Performance Index, is measuring. Here is what the PI is all about.

First, let's see where this PI value is found. On a standard window within the SlimCoach system, you see this:

Biggest Loser SlimCoach Review

In the top row, on the left side, you can see "My PI 446". That is the PI we are examining here.

The intro documentation from the SlimCoach group is fairly vague on this point. It says:

"My PI is your long term Performance Index. PI is a MYTRAKŪ proprietary health measurement and is a simple way of measuring success. If your PI increases, you are getting fitter. Your PI number is based on your energy expenditure, which is derived from your personal biometrics and the intensity and duration of the activities that you perform. As your health and activity levels improve, your PI number will increase."

OK, not much information there. Other users seem to have discovered that it goes in a range from 0 to 1,000 and is based on the amount of activity you do in a given week.

So what are my experiences? On my very first day I did 134 heart minutes, walked 11,631 steps, and with my BMR of 1350 included I burned 2,180 calories. This earned me a PI of a little over 500 points.

On day 6 my stats now looked like this:


Date Act Cal Tot Cal BMR Heart Min Steps Miles
22-Mar 830 2180 1350 134 11,631 5.3
23-Mar 400 1750 1350 61 9,449 4.6
24-Mar 660 2010 1350 97 13,592 6.9
25-Mar 770 2120 1350 102
26-Mar 830 2180 1350 111 12,842 6.2


With those values, my PI was 446. Note that this is my value looked at on the 27th with only 200 calories done for the day so far. You get penalized on the current day for looking at your PI before your workouts are done. So you only see an accurate PI value at the end of the day, when your workout is all set.

It would make more sense to me to calculate your PI from all days UNTIL today - i.e. all completed days. That way your PI always accurately displays your total fitness level up until the current day. It doesn't make sense to me to show inaccurate data for half of a day. The system should always show accurate data. I'm not suddenly "less healthy" as I am walking towards the gym.

In any case, those are the values for PI.

Post in the low carb forums if you have any questions, and I'll be happy to help out!

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