Is your fitness app's progress chart rigged to flatter you?

Say you had a rough week — sick, stressed, sleeping badly — and your numbers dipped hard. Three weeks later you're back to normal, training the way you always have, and the app shows a huge improvement. A chart line jumps up like you made a real breakthrough. Did you get that much stronger, or did the chart just pick your worst day as the starting line so any recovery looks like a win?

The easy way to build a flattering chart

Measure progress from your worst point to your best point in a window, and the chart will always look impressive. That's guaranteed, because you picked the low point. It feels good to open an app and see a line going up. It doesn't answer the real question: are you stronger now than when you started training, not stronger than your worst moment somewhere in the middle. Plenty of apps do this without bad intent. Worst-to-best is just the version of the math that always looks good.

How Yield measures it instead

Your progress is measured from the first session in the window to the most recent one, not from whatever your lowest point happened to be. An off week stays an off week. It doesn't become a flattering baseline. If the number moves up, it's because your first session and your latest one show that difference, not because the app picked favorable endpoints in between.

That means the chart can show a flat line, or even a small dip, because that's what actually happened between your first session and your most recent one. It's a less exciting chart than the worst-to-best version. It's also the true one.

Part of why Yield's numbers are actually trustworthy.

Yield Strength is in beta on TestFlight. Read more about what makes it different, or join the waitlist to try it yourself.