...for endurance riding? OK, stats: Im almost 45, keep very fit with roller blading about 45min 3-4 times per week, Karate at least 3 times per week, eat well, almost no burgers usually chicken in salad, fish, pork etc. I dont worry about good fats, olive oil, nuts, eat plenty of veggies and fruits. I do like ice cream tho. 5-10, 160 with jeans and shirt. It seems that my endurance for enduro's (repetitive?) is good for about 4 hours and the enduros are lasting from 5 to 6 hours. I hit the wall and find it rare or a brief second wind. I am wondering if I dont have enough fat to draw on once the carbs and muscle sugar is gone???? Should I try to pack another 5-7 lbs on before a race?