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Defender

$ 0.00 USD

Defender is built around four, ten-minute intervals that start right above threshold and end right below it. Designed to improve your ability to effectively pace and sustain longer, steady-state efforts (both mentally and physically), Defender is the perfect session to build aerobic fitness without leaving you too fatigued to hit it hard again tomorrow. 


Try the sufferfest for free

One subscription works across Windows, Mac, iPad and iPhone devices. Try it for free for 7 days. Cancel easily at any time. If you continue, it’s just $10 USD/month or $99 USD/year.

That's it. No games. Just getting faster.

TRY THE SUFFERFEST FOR FREE