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After a nice long workout, many people may be dehydrated. Because of a failure to properly hydrate themselves throughout the workout session. Unsurprisingly, adding a hot sweaty sauna session after the workout can only exacerbate this issue. Harvard Health recommends immediately downing 2-4 full glasses of water post sauna session in order to properly rehydrate. This recommendation comes after a normal sauna session (not after a workout), so it is safe to assume that if you also worked out before without properly hydrating yourself, you should likely have even more water!