Ever feel completely fine on the treadmill… and then five minutes into your first outdoor run you’re thinking, Why does this feel so hard? Why do my legs feel heavier? Why am I more out of breath at the same pace? Did I just lose all my fitness?

If spring running has you second-guessing yourself, you’re not alone. The shift from treadmill to outdoors changes more than you think — even if your distance and pace look similar.

In this episode, we unpack what’s actually happening when you move from a controlled, predictable surface to real ground — and why that “heavier” feeling doesn’t automatically mean you’re behind.

Before you panic or overhaul your training, let’s look at what changed… and what didn’t.