Just a problem i'd like to get to the bottom of if possible relating to my performance in race situations. On sunday i was quite happy hanging onto pretty quick runners at the Scamper and didn't feel challenged aerobically at all. When i started to slip back it seemed to be because my legs didn't have the speed any longer, this seemed to be the point of failure not my ability to get enough air in my lungs. Is this likely to be down to a poor lactate threshold or lack of muscle power? I should add i am fairly thin and find 30/32 jeans to be baggy.