Does anyone else find huge differences in their performance/feeling depending on what time they go for a run? If I go out before 5 or 6 in the evening, I feel fairly crap. At that time or after I feel fine. Weird or understandable? Just done 9 or so Kms there and enjoyed it, though 'twas cold and dark and a hilly route. Last Wed at 3 did a similar distance, less hilly and felt I needed a lift after 5 minutes. The half marathon I'm aiming for starts at 18.00!!!