Let's start answering this question with another question: 

What has held you back until now? 

I'm motivated and excited to get in the gym for a killer workout. It's been a few days because I've been so busy! First, it will be twenty minutes on the treadmill, then about twenty-five minutes of lower body exercises, and I'll finish with a solid fifteen minutes of core work.

As I approach the treadmill, I'm immediately disappointed...