Bike-run workouts adapt your body/mind to the triathlon process. You can
do triathlons without them, however, your perceived suffering will be
exaggerated. It's possible to loosen up on the bike prior to T2 and be
ready to run. What you can't do is adjust your mind to the motion
difference. Only performing bricks (bike-run) will adapt your body and
mind to the feel. On the bike you see the ground moving swiftly by under
your wheels. When you start your run the ground is moving slow relative to
what it was on the bike . Your mind tells you that you are running to
slow and therefore you compensate by trying to run faster than you should.
Most likely that first mile feels so bad because you are just pushing too
hard do to the speed differential. Adding bricks to your program adapts
your mind to that difference and teaches proper pace.
If you are seriously going to compete in triathlon, then you must train
triathlon. Swim -bike, bike-run every time you get the chance. Most
important is that first mile off the bike. Do a mile every time you get off
the bike and Amaze Yourself at how easy it will become.
> I often hear people warn against doing bike-run workouts. I agree, they
> suck, and you probably shouldn't do them often.
> On the other hand, I absolutely *love* doing run-bike workouts. I like to
> for an hour, then bike for an hour. I feel like I get the big endurance
> out of it without the pain of running after biking.
> What do other people think? Are there any particular reasons to do or
> such a workout?