How does a hang-glider pilot rise higher in the atmosphere?

A hang-glider pilot can rise higher in the atmosphere by utilizing thermals, which are upward currents of warm air. As the sun heats the ground, it causes the air above to warm and rise, creating these columns of lift. By circling within these thermals, the pilot can gain altitude. Additionally, pilots can take advantage of ridge lifts created by wind blowing against hills or cliffs, allowing them to soar higher while maintaining forward motion.