Well I thought ok today I will have go at this! and I did it!!! I walked at 3mph and the 1st run at 3.3mph, 2nd run at 3mph and the last run at 2.8 mph. The middle run seemed to hurt more but I carried on. The distance covered was 1.53 miles so I am covering a longer distance, however my pace is about 20min/mile pace, which is the same as my walking pace, how can that be, plus it hurts less.