The Sports Science of 4DP™

World-class coaches developing cutting-edge training tools

Four-Dimensional Power™ was developed in conjunction with world-renown sports scientist and coach to the pros, Neal Henderson. Having coached athletes to over 45 world championships, numerous Olympic medals, Grand Tour stage wins, and two world records, coach Neal Henderson knows that FTP-based workouts aren't enough if you want to train effectively.

The Sufferfest uses the same fitness assessment and power target algorithm Neal uses with his professional athletes to create the most effective training platform available.

No games, just gains.





What is Four-Dimensional Power™?

The Sufferfest is the only training app that utilizes your full power profile to personalize workouts based on what kind of rider you truly are. Other apps using FTP alone are simply guessing.


Read the 4DP™ FAQ


Personalized Power Targets to Match Your Unique Profile

What makes training with Four-Dimensional Power™ so effective? Unparalleled personalization grounded in cutting-edge sports science. The Sufferfest app will tailor the power targets in all of your workouts to match your unique 4DP™ profile. You’ll work at the exact intensity necessary to get stronger and faster, without wasting a single pedal stroke. Have more questions about 4DP? The answers are here.

Find Out Who You Really Are

4DP™  also tells us what kind of rider you currently are. Understanding this - which is the result of how you've been training as well as your unique physiology - helps you focus your training to become the rider you want to be (which might be a different rider type entirely). Learn more about Rider Types.

The Sufferfest app will also recommend specific workouts to both develop your strengths and address your weaknesses. No other cycling training app can do that.


Platform NMP (Neuromuscular) AC (Anaerobic) MAP (Maximal aerobic) Functional Threshold
Other training programs
NMP (Neuromuscular)
AC (Anaerobic)
MAP (Maximal aerobic)
FTP (Functional threshold)

Only From The Sufferfest

Only The Sufferfest gives you this kind of individually-optimized training. Take your fitness to a new dimension with Four-Dimensional Power™.

I've done loads of fitness tests before, but none like this. 4DP was the first time an indoor test matched what I did in a lab based environment. Simply awesome!
—Ronan O. (UK)



Try the sufferfest for free

One subscription works across Windows, Mac, iPad and iPhone devices. Try it for free for 14 days. No card necessary. Cancel easily at any time. If you continue, it’s just $14.99 USD/month or $129 USD/year.

No games. Just gains.