Training for half marathon

Thursday evening, Tom was in Karate and Jack in football. I ran almost 10 Km in 48 mins, though I do need to workout exactly what this distance is. Train station down to beach and up back. I really pushed myself. I kept watching my heart rate and on the way up kept it quite high about 170. Felt really tired at the end of it. Though good. I need to do 15 KM next. onthe road but in between I´ll do hill stuff.