Unless you intentionally spin a glider as part of an aerobatic routine, you are most likely to enter a spin inadvertently, either while working a thermal or while maneuvering close to the ground (low altitude save or low & slow while landing).
If you enter a spin from sufficient altitude, you will need to know how to recover. At low altitude, there is no time to recover from a spin, so your best bet is to avoid entering the spin in the first place by recognizing the warning signs.
|Flight Training Manual for Gliders – Holtz|
|Lessons||4.22||Incipient Spin Recognition and Recovery|
|4.23||Spin Recognition and Recovery|