I was running following the trail, struggling to control my breathing, and my legs were burning. I was training for a half marathon and I was close to finishing for the day. I began really early in the morning, and the sun was barely peaking over the horizon. I got to my finish point but I still had another mile or so to get back to my car. I caught my breath and started walking. As I was walking my mind began to wander, I had not been laid in a while, and I started thinking about sex. I had made it about halfway to my car and my horniness got the best of me. I stepped off the trail and leaned up against a tree. I slipped my hand into my panties, my fingers running through my bush that I had not trimmed in a couple of months. I immediately started rubbing my clit in slow circles, I was already so wet, and I knew it would not take long to orgasm. I pulled my shorts down and squatted, leaning against the tree. It felt so liberating being exposed in nature like that, and the cool air on my pussy. I continued rubbing my clit, and I used my other hand to slip two fingers in me. I was slow at first, but I picked up the pace and finger fucked myself faster. I had to bite my lip to stifle my moans, and I did not want another person to hear me. I felt the orgasm rising in my body and I kept the pace with my hands. I started to cum, my pussy clamping down on my fingers and my legs quivering. I shifted forward to my knees to catch my breath again. I stood up, fixed my shorts and stepped back onto the trail. I made it about another hundred yards and I passed a couple runners, my timing could not have been better. I smiled and greeted them, despite my body aching I felt pretty good, and I felt as if I could run another ten miles.