For me this is true.

My commute is only 10 miles round trip. The first month or two I'd work hard and get pretty out of breath and my legs would hurt. Ofcourse I was always riding pretty hard as I see the commute as a replacement for driving to "the club" and taking a spinning class. Over time I'd easily be able to ride faster and faster. The legs did get much stronger and for the most part didn't bother me much any time during the Fall or Winter. During the Winter there was much more Wind so that had my lungs working much harder. Spring finally arrived 3 weeks ago... for a while it seemed like Winter would never leave is here in the "frozen" North. For the first week life was easy as the Winter winds appeared to be lessening, the Studded snow tires came off, and I could ride with fewer layers. Now the commute was being coming easy and somewhat boring.

Then I went and bought a road bike... Now I ride the road bike any day the weather looks clear and use the hybrid is there is a chance of rain. I also use the hybrid to bring a few days woth of extra cloths, and extra cans of soda (I have just love my ONE 12oz can of Pepsi at lunch), and any other supplies I may need. When I have the road bike I'll regularly take a long ride in or home adding an other 10 to 15 miles to my commute. So my base commute is getting easier, but I have made it more fun and interesting my adding distance and therefore I just go longer and faster. Just yesterday I had the need to go to one of our satelite offices. What a great excuse to ride an extra 25 miles!

So there you have it. When the commute gets easier, you'll start getting adicted and invariably you'll find more and more reasons to go for a ride. Therefore it doesn't get easier... but you'll be a MUCH stronger rider.

Enjoy the ride,
André