I ran three 5-minute intervals on the treadmill this morning, running at an 8:13 pace between. My idea was that I would alternate between hill intervals and 10K-pace intervals. After this morning's run, however, I think I may need to rethink my hill intervals in terms of pace, duration or both. I ran my first interval at the same 8:13 pace I had been running but on a 10 percent incline. I finished the interval, but I was worried I might throw up. After 5 minutes of recovery, I ran a 5-minute interval at 10K pace with no real problems. After another 5 minutes of recovery, I started another interval on a 10 percent incline. Because the first hill repeat took so much out of me, I slowed the pace to 8:30. It wasn't nearly enough, and I abandoned the interval at 3 minutes. I had hoped to run on steeper inclines to get the same effect as running faster on flat ground while improving my ability to run faster up hills. In theory, the idea is sound, but in practice I need to tweak the intervals a bit. The 5 minutes at 10 percent were much harder than 5 at 10K. The incline and speed I used today would be great for shorter intervals, but for 5 minute intervals I need to decrease the incline or my speed or both. I wonder how slow I'd need to run to do 30-minute "tempo" runs at 10 percent.
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