I'm trying to understand how some pilots use small bumps or turbulence to gain lift. Flying "active" usually means going hands up in a bump, which speeds you up, and it is exactly what you don't want when trying to stay in lift. But slowing down too early can cause a stall, especially on sensitive wings. A friend seems to do it well but can't explain how. I fly an EN-C and want to learn. How do you do it?