For the last few weekends I've been running to Audiofuel's 'The First Hour' Run Easy and managing around 8k in the hour. As I get frustrated with myself and want to get faster, this morning I bought 'Run Free', which is faster bpm, and thought I'd try that. Big mistake! I was really struggling after 10mins so no way I could keep it up for an hour. Lesson learned I guess - I'll stick to the slower one for now and hope that speed will come eventually!