Well )))) - you have to come to Russia to find out all the details. BUT - what they do - hitting not only back but all the body of each other by birch branches inside BANYA (sauna) where the temperature is about 70C and wet. Here they do that inside temporary tent heated by (most likely) pouring water onto stones (previously heated in the open fire). Actually its common practice to clean the body and increase micro-blood circulation (considered healthy). It cities there are many stationary banya/saunas - with common halls (up to 100 visitors) and privates for like 4/6 or 10 guests. Most hotels/motels/camping areas has banya/sauna as well. No sex (as a rule - sure - there are exceptions especially in small private saumas where people coming mainly to have sex after shower ) involved. Beer or tea normally served after the procedure. PS: If Russia is too far by distance, similar practice you may find in Finland or Sweden. Yes - almost forgot - NUDITY is mandatory )) - no excuses. And yes - all men you see in this video are straight. Ladies also participating also nude.