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I've recently had a shocking change of heart as a runner: I no longer dread the treadmill. What changed? For one, poor air quality has left me no other choice. And secondly, I stopped using the treadmill solely for speed workouts, and started using it for hills.

I have to admit, this change of heart comes from the trendy 12-3-30 "hot girl walk" workout. In fact, now some of my favorite training sessions happen at a walking pace on my Merach 450 walking pad right at home. The key is incline.

Whether you choose greater incline or speed drills really depends on your goals. I'm coming at this decision from the perspective of marathon training, but I know the motivator for so many gym-goers: Which one will help me lose weight?

The truth is t

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