The popular 80/20 approach to training promotes doing 80 per cent of your training at an easy effort and 20 per cent hard.

Seiler’s endurance epiphany occurred in the ... ‘Whether the elite is training 20 or 40 hours a week, the training broadly follows this 80/20 split,’ says Seiler. At the extreme end, Paula ...

Though brain endurance training comes with an evident stack of benefits, “it’s not for every athlete,” says Ring. BET is hard ...

And that’s certainly the case with Joe Friel, who, in addition to the Training Bible has authored 18 books and is currently working on a 19th book on endurance ... 80% easy effort with 20% ...