RW SmartCoach 1/2 Marathon Plan

I found another training program for a 1/2 marathon on Runner's World that I'm posting here. I like this plan because of the "rest/XT" designation! I'm not so keen on the Tempo Run stuff...not really sure how to do that, or if it's even necessary. We'll see. I should actually time myself on another 10k or 5k so the times listed here will be more accurate.

Wk Dat Mon Tues Weds Thurs Fri Sat Sun Total 1 6/7 6/13 Easy Run Dist: 2 mi @11:05 Rest / XT Tempo Run Dist: 5 mi, inc Warm; 3 mi @ 9:29; Cool Rest / XT Rest / XT Long Run Dist: 6 mi @11:05 Rest / XT 13 miles 2 6/14 6/20 Easy Run Dist: 2 mi @11:05 Rest / XT Speedwork Dist: 5 mi, inc Warm; 2x1600 in 8:57 w/800 jogs; Cool Rest / XT Rest / XT Long Run Dist: 6 mi @11:05 Rest / XT 13 miles 3 6/21 6/27 Easy Run Dist: 2 mi @11:05 Rest / XT Tempo Run Dist: 5 mi, inc Warm; 3 mi @ 9:29; Cool Rest / XT Rest / XT Long Run Dist: 7 mi @11:05 Rest / XT 14 miles 4 6/28 7/4 Easy Run Dist: 4 mi @11:05 Rest / XT Easy Run Dist: 3 mi @11:05 Rest / XT Rest / XT Easy Run Dist: 3 mi @11:05 Rest / XT 10 miles 5 7/5 7/11 Easy Run Dist: 2 mi @10:59 Rest / XT Tempo Run Dist: 6 mi, inc Warm; 4 mi @ 9:28; Cool Rest / XT Rest / XT Long Run Dist: 7 mi @10:59 Rest / XT 15 miles 6 7/12 7/18 Easy Run Dist: 2 mi @10:59 Rest / XT Speedwork Dist: 7 mi, inc Warm; 3x1600 in 8:51 w/800 jogs; Cool Rest / XT Rest / XT Long Run Dist: 8 mi @10:59 Rest / XT 17 miles 7 7/19 7/25 Easy Run Dist: 2 mi @10:59 Rest / XT Tempo Run Dist: 6 mi, inc Warm; 4 mi @ 9:28; Cool Easy Run Dist: 2 mi @10:59 Rest / XT Long Run Dist: 8 mi @10:59 Rest / XT 18 miles 8 7/26 8/1 Easy Run Dist: 4 mi @10:59 Rest / XT Easy Run Dist: 4 mi @10:59 Rest / XT Rest / XT Easy Run Dist: 4 mi @10:59 Rest / XT 12 miles 9 8/2 8/8 Easy Run Dist: 2 mi @10:52 Rest / XT Tempo Run Dist: 7 mi, inc Warm; 5 mi @ 9:28; Cool Easy Run Dist: 2 mi @10:52 Rest / XT Long Run Dist: 9 mi @10:52 Rest / XT 20 miles 10 8/9 8/15 Easy Run Dist: 2 mi @10:52 Rest / XT Speedwork Dist: 8 mi, inc Warm; 4x1600 in 8:46 w/800 jogs; Cool Easy Run Dist: 2 mi @10:52 Rest / XT Long Run Dist: 9 mi @10:52 Rest / XT 21 miles 11 8/16 8/22 Easy Run Dist: 2 mi @10:52 Rest / XT Tempo Run Dist: 7 mi, inc Warm; 5 mi @ 9:28; Cool Easy Run Dist: 2 mi @10:52 Rest / XT Long Run Dist: 10 mi @10:52 Rest / XT 21 miles 12 8/23 8/29 Easy Run Dist: 5 mi @10:52 Rest / XT Easy Run Dist: 5 mi @10:52 Rest / XT Rest / XT Easy Run Dist: 5 mi @10:52 Rest / XT 15 miles 13 8/30 9/5 Easy Run Dist: 2 mi @10:45 Rest / XT Tempo Run Dist: 8 mi, inc Warm; 6 mi @ 9:27; Cool Easy Run Dist: 2 mi @10:45 Rest / XT Long Run Dist: 10 mi @10:45 Rest / XT 22 miles 14 9/6 9/12 Easy Run Dist: 2 mi @10:45 Rest / XT Speedwork Dist: 10 mi, inc Warm; 5x1600 in 8:41 w/800 jogs; Cool Easy Run Dist: 2 mi @10:45 Rest / XT Long Run Dist: 11 mi @10:45 Rest / XT 25 miles 15 9/13 9/19 Easy Run Dist: 2 mi @10:45 Rest / XT Tempo Run Dist: 8 mi, inc Warm; 6 mi @ 9:27; Cool Easy Run Dist: 2 mi @10:45 Rest / XT Long Run Dist: 11 mi @10:45 Rest / XT 23 miles 16 9/20 9/26 Rest / XT Easy Run Dist: 2 mi @11:05 Rest / XT Tempo Run Dist: 5 mi, inc Warm; 3 mi @ 9:29; Cool Rest / XT Rest / XT Race Day Dist: Half-Marathon @9:26 Time: 2:03:50 20 miles