After you’ve been running for 30 to 45 minutes at least three times a week for six to eight weeks, you’re ready to start running occasionally at 85 to 90 percent of your physical capacity, or the point where lactate is building up in your muscles but your body is still able to 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
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