越野跑 / Trail Running

I did not do any trail running for almost two years. So, I am quite happy to discover that I could still do a 80-minute run without stopping (well almost - with the exception of one stretch where the grade was a good 20+ percent and my uphill run slowed down to a brisk walk). If I can train at this level and be able to sustain myself over 158 kilometres in two days (burning abt 500-700 kilo calories/hour over 6 hours each day), I might even consider doing the Canadian Ski Marathon this winter !!!