How does Smart Trainer Studio simulate real courses?

Best Bike Split dynamically sends FTMS bluetooth values per segment: road grade, surface-specific Crr (rolling resistance), wind speed, yaw-adjusted CdA (from your bike profile), and altitude-corrected air density, for lifelike resistance. You do need to ensure that your athlete profile has accurate weight and FTP, and that your trainer is setup for the correct user/bike weight.