Just as challenging as running uphill is running into headwinds. You have to work harder when you're battling a headwind. Not to mention that a headwind, even a gentle breeze (8-12 mph) can slow you down by 8 percent.
Where I run, I usually start facing the wind which can be discouraging right at the start. However, I'd rather run into headwinds while I'm fresh with energy than run on my way back when I'm already tired. And besides, I do look forward to running with the wind on my back on my way home. It's like getting a lift on your legs and feels like sailing on the road, helping me finish strong.
Headwind or tailwind, the wind is a force that's only known by its effects. It's just like the Holy Spirit. The Holy Spirit is God in motion, working in our lives and reminding us how much God loves us and how much He wants to give to us - more wisdom, more peace, more love, and more things we can't even think of. And that's the role of the Holy Spirit - to constantly remind us of His loving presence all around us.
That's what I think of when I start feeling the wind whether in my face or at my back. God is with me all the time and helping me move along.