Originally Posted by GeorgeBMac

Yes, that's true... But also lack of maintenance on the body -- as in cycling and the gym -- can cost you a whole lot more money...
(Ooops, I forgot, you English blokes don't have to worry about the cost side of that equation -- but the idea still holds)

I tend to think of 'regular' exercise as a way to supplement what I get on the bike (such as weight training and such)...

But, I think the most important thing is that it is both enjoyable and NOT a pain. My rule is that the gym should always be within 15 minutes drive -- otherwise, if it's too much of a hassle I can always find a reason why I shouldn't go tonight... And if you don't find spinning enjoyable, then do something else. It's one of the advantages of belonging to a fully equipped gym: there are always alternatives.