What 'the math' actually does

You show up, log what you lifted, and the app uses that result for the next session. Here is the useful part of the work happening between sets.

What Rackd reads

When you finish a session, Rackd records the weight, reps, RPE when you enter it, and the program rule assigned to that lift. That is the input: the last result plus the rule.

The 11 progression systems

The training engine contains 11 progression systems:

• Linear progression
• Wave progression
• Double progression
• Undulating progression
• Step progression
• Top-backoff progression
• AMRAP progression
• RPE-based progression
• Absolute-increment progression
• 1RM ladder progression
• Variation progression

A program uses the system that matches its authored structure. You do not need to calculate the next number between sets.

What lands on the next session

The next session shows the target produced by the rule and the recorded result. A successful session may add load, reps, or a harder variation. A miss may hold the target or trigger the rule's deload response. The exact change belongs to the program, not to a generic promise.

Coach can report the decision and the next useful action. Coach is an anonymous software voice, not a human coach or medical professional.

That is the loop. Train, record the work, and let the program make the next step readable.