
UnitedHealthcare's Aussie star rides machine like the devil

Aussie fast man now retired

Custom drillings and TT rings highlight Zabriskie's road bike

One of the dozen P5s in existence takes the TT start in California

Audio and visual cues in the videos direct when to put in an effort - and to extract the most benefit, it behooves you to dig hard.
Photo credit © The Sufferfest

This cheeky warning greets you in the opening segment - and when they mention 'pain' and 'suffering', they're not joking.
Photo credit © The Sufferfest

While there's no voice actually screaming at you to go harder, the exclamation points in the text prompts are surprisingly effective.
Photo credit © The Sufferfest

It's useful for users to have a good idea of their aerobic limitations in order to follow the prompts accurately. A power meter would be best but a heart rate monitor will do.
Photo credit © The Sufferfest

On-screen prompts let you now how much longer you've got left in a given interval.
Photo credit © The Sufferfest

Each video starts with a proper warm-up and ends with an easy cool-down.
Photo credit © The Sufferfest