This type of tameshiwari is popular with kiyoshide shinjo of uechi ryu. Usually done in sanchin kata. Mr Shinjo has conditioned his body remarkably.
here is an example:
http://www.youtube.com/watch?v=RWfXX5aQhjcAlthough IMHO, tensho should not be performed this way. Tensho and Sanchin of Goju Ryu are like the Yin and Yang of china. They are opposites, but complement each other. Tensho should be performed relaxed (soft of Goju Ryu) and Sanchin performed tense (hard of goju ryu). This performance of Tensho is similar to Sanchin, just a different embusen (kata pattern). However many mainstream Goju Ryu schools also perform Tensho this way, including Jundokan and derived schools.
I am mearly expressing my opinion and mean no disrespect to the people in the video.