Yep, HR can tell you a lot (power meters are pricey, but indeed are the best option). If your HR rises too quick you're likely off pace however though. Another

Yep, HR can tell you a lot (power meters are pricey, but indeed are the best option). If your HR rises too quick you're likely off pace however though. Another thing you can do is thinking of saving some gas in the tank for the last bit of the climb where you'll sprint as you summit. Start with this in mind at the bottom