nope

I do, and caffeine is definitely not required

My comment had nothing to do with caffeine, but rather blaming energy levels on caffeine or lack thereof. Most people I see who are trying to figure this out are doing everything but lifting weights & playing a sport. Doesn't even have to be heavy weights, just something consistent over time.

Starting Strength + climbing

Caffeine disrupts circadian rythm, so it's valid to "blame caffeine" on low energy levels.