Mmmm I definately do this too, sometimes I have really crap days and get really down about cycling and think bugger it all why dont i just learn to drive like everyone else, but then a couple of weeks later there is always a nice morning ride in the sun when it's quiet and it makes it all worth it.
Also swapping bikes can quite muck you up, after 2 weeks on my fixed gear the road bike is weird and knackering and vice versa and after a couple of rides its ok again, I think it's not that you loose fitness but you are just in different positions and cadence and using slightly different muscles.
Mmmm I definately do this too, sometimes I have really crap days and get really down about cycling and think bugger it all why dont i just learn to drive like everyone else, but then a couple of weeks later there is always a nice morning ride in the sun when it's quiet and it makes it all worth it.
Also swapping bikes can quite muck you up, after 2 weeks on my fixed gear the road bike is weird and knackering and vice versa and after a couple of rides its ok again, I think it's not that you loose fitness but you are just in different positions and cadence and using slightly different muscles.