I'm sure there are a lot of small reasons vs. one main reason that my ride today I felt a little weaker than usual. Last week I rode 3 days in a row on my trainer to increase my mileage endurance. Did some hill simulation work but that only helps so much. Today I finally got outside to ride. Winds were high with gusts that when it was a cross wind, almost knocked me over. So when that was a head wind during a ride that was always going either up or down a hill, that isn't going to help. Whats the best way to simulate hills on a trainer? Long steady low cadence say 10 minutes at a time, or shorter time with a higher intensity level, or both?