The past Sunday race showed me that I lack endurance on a longer climb (2 miles+). I have a OK power to weight ratio (5w/kg) but couldn't last more than 5 minutes. What is the best way to improve my sustainable effort? Around here in NYC (NJ side), the longest climb I could find and the nearest is about 1.3 mile long. Should I can find some longer climb to train for climbing endurance? Or continue to do these intervals on a shorter climb but with greater intensity?? This would somehow translate into greater climbing endurance???