Volume, estimated 1RM, and trend lines — what each chart is really telling you, and which one to trust when they disagree.
Charts are only useful if you know what question each one answers. Bikkel gives you three main views, and each has a job.
Estimated one-rep max turns any set of weight and reps into a single strength number, so a heavy triple and a lighter set of ten become comparable. Watch its trend, not any single point — a rising line over weeks means real strength, even if today’s session felt bad.
Total volume — sets times reps times weight — tracks how much work you are accumulating. Flat or falling volume next to a stalled 1RM usually means you are under-doing it. Spiking volume next to worse performance means the opposite.
One session is a data point. Only the trend line is the truth.
Read the charts weekly, decide monthly, and let the trend — never a single bad day — drive the next block.
Open your logbook and turn this guide into a real, logged session.