Dear Running, I wanted to write and say I have missed spending hours and hours with you, but the truth is I don’t. You were my first fitness love. I’ll always have a spot in my heart for you and I’m certain the challenge you bring me will always taunt me. I’m not exactly giving up on “us” but I need something you’re not exactly giving me… muscle. See, we were exclusive for 2 years, and they were two great years. I got faster, found courage and drive I didn’t know I had, and attempted things I never thought I could do. We have spent many hours together through blood,…