Training methodology for people who log every set: progression models, autoregulation, weekly volume, and notes from building GETSIXPACK.https://getsixpack.appen-ushttps://getsixpack.app/blog/estimated-1rm-which-formulahttps://getsixpack.app/blog/estimated-1rm-which-formulaEpley, Brzycki and Lombardi disagree by 3% at eight reps and 12% at twelve. Which to use, when the number is meaningless, and why an app must name its formula.Tue, 04 Aug 2026 00:00:00 GMTLoggingProgressionhttps://getsixpack.app/blog/deload-weeks-markers-not-the-calendarhttps://getsixpack.app/blog/deload-weeks-markers-not-the-calendarEvery fourth week is a scheduling convention, not a training decision. The signals that actually mean you need a deload, and why one on its own is never enough.Mon, 03 Aug 2026 00:00:00 GMTRecoveryProgressionhttps://getsixpack.app/blog/how-long-to-rest-between-setshttps://getsixpack.app/blog/how-long-to-rest-between-setsNinety seconds is a floor, not a target. What the rest interval actually buys you, why it belongs to the exercise rather than the session, and what cutting it costs.Sun, 02 Aug 2026 00:00:00 GMTRecoveryProgramminghttps://getsixpack.app/blog/how-many-sets-per-muscle-per-weekhttps://getsixpack.app/blog/how-many-sets-per-muscle-per-weekMEV, MAV and MRV explained as what they are: a range to steer inside, not four numbers to hit. Plus the counting rules that decide whether your total is real.Sat, 01 Aug 2026 00:00:00 GMTVolumeProgramminghttps://getsixpack.app/blog/rir-vs-rpe-what-to-loghttps://getsixpack.app/blog/rir-vs-rpe-what-to-logRIR and RPE are the same scale read from opposite ends. Which one to log, why RPE 10 is not failure, and why half points are usually finer than the instrument.Fri, 31 Jul 2026 00:00:00 GMTLoggingProgressionhttps://getsixpack.app/blog/double-progression-explainedhttps://getsixpack.app/blog/double-progression-explainedDouble progression adds reps first and load second. Here is the rule, the two numbers it needs, and the three places lifters break it without noticing.Thu, 30 Jul 2026 00:00:00 GMTProgressionProgramming