Hopefully you understand now that muscular endurance on the bike has almost nothing to do with the gym. On climbing rides your muscular endurance and W/kg are better indicators in how long it will take. I’ve done some road rides around Tahoe that were 100 miles and >8000 feet of climbing in 8 hours. That is possible at just below 3W/kg if you don’t fade on the climbs, which in training only requires being able to do long 1-3 hours of tempo / sweet spot rides. And of course eating enough carbs on the bike and staying hydrated. No gym work required.
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