Quote:
Originally Posted by Hog's Gone Fishin
Really! Your conditioning has improved greatly! In one week! 
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Dude don't be a dick.
If someone drinks regularly, after 8 days of abstinence you have more energy, your body is processing energy differently, and you sleep better once asleep. Conditioning can even just be seen as having energy and focus. Doesn't mean he went from 25% BMI to 15% BMI in a week. Could just be energy level or how much longer he's able to keep a pace on treadmill or more reps etc. Taking out alcohol can definitely start to show benefits within a week.
Maybe it has improved noticeably rather than greatly, but that depends on one's perspective.