The Science of Zone 2 Training: Why Slow Running Makes You Faster

Most runners go too hard on easy days and too easy on hard days. Zone 2 training is the missing piece that separates good runners from great ones.

Most runners make the same mistake: they go too hard on easy days and too easy on hard days. The result? A mushy middle ground that builds neither speed nor endurance. Zone 2 training — running at a conversational pace where you can still hold a full sentence — is the foundation that elite athletes build their training on.