I used to fly hang gliders. For almost every issue (except for flying too fast), when you get into trouble in a glider you lower your AoA and increase speed.
You certainly learn to pay attention to the aerodynamics. Lots and lots and lots of high-bank turns. Many of them relatively low and close to stalling speed.
Some occasionally below stalling speed, if you're high enough to safely reduce margins so much that a gust of tailwind puts you below, which requires you to just calmly follow through with constant angle of attack, descending, rather than force the nose up.
Short-field landings in unfamiliar places, requiring judgements of both approach angle and terrain. Moderate to heavy turbulence all day, speed varying from stalling to redline. Retractable landing gear. Flaps if you want that source of mental load too, in all speed regimes. Constant consideration of wind. One shot landings. Mountain flying with constant consideration of where the safe exit is. Consideration of deteriorating weather. Always aware of nearest landing site.
It's really non-stop training in all the fundamental parts of flying, minus engine operation, airspace and ATC communication.
