The principle
Lift a weight to failure, recover, come back, and lift it again. If you can do more reps this time, you've adapted — and it's time to make the stimulus harder. Usually that means adding weight. The cycle repeats: one set to failure, recover, progress.
Double progression
The standard HIT method is double progression. You pick a rep range — say 8 to 12. At a given weight, you progress reps session by session until you hit the top of the range (12). Then you add a small amount of weight, which drops your reps back toward the bottom (8), and progress reps again. Weight progresses, then reps, then weight — a steady climb.
Earned, not assumed
Adding weight before you've earned it breaks form and risks injury. Adding it too late stalls adaptation. The honest signal is your logged performance: did you hit the target reps at the current weight? If yes, the next weight is earned. Failure Point reads your logs and tells you.
Calculated, not guessed
Failure Point does the arithmetic: it watches your working sets, checks whether you've hit the progression threshold, and prescribes the next weight. So progression is objective — and tied to recovery, not a calendar. See also evidence of adaptation.