Blog
Notes from Fit Phase
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The Casey Butt calculator: the formula behind your natural ceiling
Casey Butt's equations predict your drug-free muscular potential from height, wrist, and ankle. Here's the actual formula, a worked example, and how far to trust it.
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Cut, bulk, or maintain: choosing your next phase
A simple framework for picking your next phase — and knowing when to end it — instead of drifting between goals.
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The scale lies daily. Your trend doesn't.
Daily weigh-ins swing for reasons that have nothing to do with fat. Here's how to read the signal underneath the noise.
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How much muscle can you actually build?
Your frame sets a ceiling on drug-free muscle. Here's how to estimate it — and why it should inform your plan, not discourage it.
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Introducing Fit Phase
A bodybuilding tracker built around the phases of your plan — cuts, bulks, and the check-ins that keep them honest.