Shortly after I got my power meter last June, I signed up with the online cycling training platform Xert.

The ideas behind it are interesting, and promising:

Firstly, a software-based adviser that recommends workouts based on your current training status. Tired or fresh? Building or peaking? The recommendations will vary based on your current situation. And if you're targeting a road race you'll get different advice than if you were peaking for a criterium. If you miss a couple of days training, it will seamlessly adapt its recommendations, as there is no 'plan' as such. If you're feeling fresh and energetic, you can increase your ramp rate to 'aggressive' and Xert will adjust. If you're tired, select 'taper' or 'maintenance' and it will slow down.