Actually, in my case it's my gut.
Now that summer is over, the challenge is fighting off the Fall Weight Gain. I usually gain ten pounds by late October. Then I hold steady until late January, when the inactivity and munchies that accompany the end of Winter finish me off, and I'm struggling to lose twenty pounds even as I schedule my annual physical.
So, lots of veggies! Long walks! Cut down on the butter! Oy.