This app automatically calculates a custom pyramid workout schedule for you, based on the weight and repetitions you successfully performed, to help build both fast twitch and slow twitch muscle fibers. A pyramid workout schedule decreases the repetitions per set of each exercise while increasing the weight per repetition. On a 6 week or 12 week schedule, each exercise is repeated weekly until the "max out" (single repetition week), then the pyramid is automatically recalculated based on your single repetition maximum weight.
https://www.google.com/search?q=pyramid+weightlifting