Rep Clock turns the Twenty Every Twenty idea into a deliberately simple working tool: it rings at a chosen interval, prompts for the reps just completed, and keeps a lightweight history without turning the routine into a full fitness programme.

This is a companion tool, not evidence that the exact 20/20/20 numbers are scientifically optimal. Its job is to make Tim's existing personal routine easy to run and record while preserving the original point of the practice: a simple physical interruption to long periods of desk work.