I've just been out cycling for a couple of hours.
I've also just read this post, on But Why?'s site. It describes, with uncanny accuracy, how I feel having been out cycling for a couple of hours.
Therefore, in some kind of circular logic (given that this feeling is of uselessness and contentment), it has saved me trying to find the words to write how I feel having been cycling (you guessed it) for a couple of hours.
Thanks Dr But Why?, there's a cheque in the post*.
*not strictly true. Not true at all in fact.