PRIVATE BETA · WINTER 2026
Your training data isn't telling you anything.
You have four years of runs, a heart-rate zone chart and a fitness curve. None of it answers the only question that matters four months out: am I on track for my goal race?
Bib reads what you already record and gives you one straight answer every morning — plus the workout that follows from it.
Email only. No card, no onboarding survey.
Sacramento
THE MATH
Three numbers, and no black box behind them.
You already know what a fitness curve is worth. These are the three we compute, exactly how we compute them, and what each one can't tell you.
Efficiency factor
How much speed you get per heartbeat. It rises as aerobic fitness improves and it is the single most honest signal in your data — because you can't fake it by running harder.
Heat, illness and hills all depress it, so runs above 24 °C are flagged and weighted down rather than deleted.
Load ratio
Whether this week is a sensible step up from the last month. Under 0.8 you're detraining, over 1.4 you're gambling. Between them is where adaptation actually happens.
It's a guardrail, not a prediction. It tells you what not to do next week.
Race projection
Your best recent efforts extrapolated to race distance, then adjusted for where you are in the block. Shown against your goal — and against the standard you're chasing.
Thin evidence gives a wide band, and we say so. A tune-up race narrows it more than six weeks of easy miles.
Those three numbers become one workout and one sentence about yesterday. Not a dashboard to interpret — a plan that already accounts for the run you actually did.
CONNECTIONS
Keep Strava. Keep your watch. Keep logging nothing.
Bib doesn't want to be your training log. Strava is a good one and you already use it — we read from it, we don't replace it. Two connections, both read-only, and you never enter a workout by hand.
Nothing is written back to your accounts, and nothing is shared. Disconnect and your history comes with you.
Find out on a Tuesday, not on race day.
Private beta opens this winter, one training block at a time. Tell us where to send the invite.
Email only. We'll write once when it opens, and not otherwise.