I was tempted to go home when i was going round sefton park as I was soooo tired (I live right by there) I am so glad I didn't. By the time I was back on Princes Avenue I was vowing never again......then by Monday already planning to do it next year with proper training. ( I had been training up to August but circumstances intervened) I hadn't even been trying out power drinks or anything and found it such a boost when I tried it just before the tunnel I could notice a sharp rise in my energy and spirits.