My friend Jack Taufer is a now not-so-secret source of the fabled “invisible” jiu-jitsu that Rickson Gracie and his lineage of black belts are renown for. You should remember Jack from my recent video about finding simpler solutions to problems. Budo Jake had Jack in the Budovideos studios to film five instructional videos to help promote BJJ vs Cancer, Jack’s effort to raise funds for his sister and her family as she fights stage 4 breast cancer. You can contribute to the fundraising at gofundme.com/bjjvscancer. He is just over halfway toward the goal. I am sharing all five of Jack’s recent technique videos below.