Yeah! I'm generally nackered most days but I think it’s mostly down to School and work etc... True, Riding does tire you out especially after when you pushing yourself! I Usually find that it is down to what I eat/drink; For Instance if I set off early in morning to catch a Train and I don't have time for breakfast I generally find myself really 'worn out' at the end of the day. I know they say, "Breakfast is the most important meal of the day" I think it ACTUALLY is... Thanks