1 · Gym lore — 'cardio after weights spares glycogen'
The lift-first slogan says cardio burns through glycogen, but 30 minutes of moderate cardio uses only about 25-35% of muscle glycogen, so the slogan overstates it.The 1980-2000s gym slogan: lift first, cardio after, on the reasoning that cardio will burn through glycogen and leave you with no fuel for the lifts → strength training takes a hit.Internal logic of this claim:
· Strength training mostly relies on muscle glycogen (the 1-3 minute anaerobic energy band)
· A 30-min steady-state cardio session does deplete some muscle glycogen
· So protect glycogen → strength first sounds reasonable.
But the exaggerated parts:
· 30 min of moderate cardio uses only ~25-35% of muscle glycogen stores — 65-75% remain for subsequent lifting
· Each lifting set only uses a few seconds, and rest between sets allows local glycogen recovery
· Glycogen depleted → training ruined is an edge-case scenario (over 90 min of high intensity), not normal same-day training.
Origin: Hickson 1980 (next step) + gym word-of-mouth + nobody reading the original → one slogan ran the field for 40 years.
The modern conclusion (Wilson 2012 ): order does matter, but far less than the slogan implies — and it depends entirely on your primary goal.