Great Half marathon workout to perform 3-4 weeks before

Today at the running group (5:30pm) the workout is Half Marathon Alternations: 7 mile run and within this run alternating paces of 1000m at 10 seconds under you half marathon goal pace followed by 600m at 30 seconds slower than your half marathon goal pace. Once again, shoot me a message if you don't understand. This workout is a modification of a workout that one of the Oregon Project assistant coaches gives his half-marathon runners. Have a great 3.5 weeks leading up to Hapalua and I will see everyone hopefully in a few weeks. - Coach Nate