Using SimWatts only requires two basic items:
That's it - The app will do the rest.
If you don't have one of the listed trainers, drop us a note. We're always adding new ones and we love to hear from you. In the meantime you could select any other trainer in the list. Whilst the power reading probably won't be accurate to the truth (due to the difference in power curves from trainer to trainer) it is still a perfectly good reference point - So long as you use the same one every time!