VO2max

Training theory: output at VO2 max while climbing may have a high predictive value for athlete progression and regression over time, particularly with age. Constant reinforcement of this metric may improve performance at all effort levels, including long ultras, and can seem to reverse the athletic decline process in some cases.

Whether you're training for your first 10k or 10th 100-miler, you need to know how to structure a training plan.

Working on vVO₂ max might be the quickest way for some athletes to improve climbing and trail performances.