"I’ll feel this when I wake up tomorrow morning."

That’s what I thought as I went through my new exercise regime with my personal trainer this afternoon.

But it hit me sooner than that. I felt it when I started down the stairs outside the drugstore that I visited after the gym. As my knee bent to lower me to the first step, I struggled to turn on my metaphorical brakes. My knee wanted to keep flying forward under the heavy weight of my body. I took a deep breath and pulled myself up. I had to work at each of the twenty or so steps.

Actually, I had felt the strain at the gym, too. My muscles quivered as I moved the free weights.