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Tough speed endurance session today. On the treadmill, 500m warm-up jog, then 6 x 600m on 4:20/km pace with 200m recovery between each one. The first two were on 4:15 and 4:18/km pace but the 4:20 pace was easier to maintain. I jogged it up to 6km to finish. I've had a mild chesty irritation for the last couple of days. Really hoping I didn't overdo it today!