.Running the second half only 1:13 slower than the first was a real achievement for me, and required a lot of focus. My heart rate was a steady 153 bpm for the first 10 miles, but then rose slowly but surely, reaching 171 in the last mile as I concentrated

by now, but you could still be settling into the groove. Simonlala was concerned about his heart rate. “I had trained for 30 weeks at 140 beats per minute and yet the first three slow miles were coming in at 153 beats per minute. Looking back, I guess

the thread Running slow to run fast I’ve just run my first marathon and I've decided to use the next three to four months for aerobic base training at a low heart rate to (hopefully!) increase my speed. If you’ve used this method, how did you find