Have some kind of training plan for your indoor training. If you are just pedaling along on the trainer with the same intensity every time you ride you are doing yourself a disservice.
I honestly believe that anyone can complete a sprint triathlon without having to spend a ton of money on equipment or having to dedicate their whole life to training.
The route is about 50 miles with a little bit less than 4000 feet of climbing, but at least you do get the mid-ride reward of donuts and cider after all of that climbing.
It was a dark and stormy afternoon when I was forced to bring my trainer out for the first time this season.