Not only character building but incredibly less boring!!
the boredom is my big complaint about indoor training.
a indoors bicycle makes about as much sense as a football bat.
i ride rollers when i absolutely, positively have no hope of venturing outside for several days. the only relief from boredom on rollers is the challenge not to sprint right off the devil thing and end up crashing into the television! i can only imagine the boredom a magnetic/hydraulic/fan trainer stand must be.
as far as character goes...well, let's just say that we have to be nutz to begin with to ride outdoors when the temperature drops to below freezing.
i managed a quick 15 miles last night after work, but all the cars had their lights on during the last 2-3 miles and visibility was far from optimum for about half the ride. today it's overcast, but a warmish 62° f! it's time to get off the keyboard and on the pinarello.
be careful out there friends!