clear and process it. Build to where you can maintain that lactate threshold level for 5 minutes. Then take 1 minute of easy running to give the body time to recover, then repeat. As you progress, increase the number of the intervals and their length while maintaining a 5:1 ratio between work and rest. So you would do 10-minute intervals of hard running followed by 2-minute breaks, or 15 minutes of hard running followed by 3 minutes of rest, and so on.
