Half marathon training - Week 3 - Speed run

Today's speed run went well. I actually managed to stick to plan and was able to do the 3 repeats of 1600m (1 mile). I covered 4.5 miles in a time of 35:47, for an average pace of 7:49/mi. Each repeat was around a 7:30 pace, with a half mile in between at around an 8:30 pace. I followed up the run with about 10-15 minutes of hard work on the bike, which is my new thing. I realize I would be better off doing this on my non-running days, but I figure on the days I actually make it to the gym, it's better to mix it in than not do it at all.