4.15 miles slow, 2x3K steady, hill reps

Went out in the morning with Natasha for just over 4 miles around the West End. In the afternoon I tried out a new and uncalibrated Nike+ sensor (attached to the laces of a different pair of shoes) on a steady run down to Gardner Street for 4 hill reps, and then back again. It underestimated the actual distance - just short of 3K - by about 10% both times. The hill reps were untimed. On this occasion I didn't have to walk on the way back.