He has helped tens of thousands of grapplers improve their skills via his articles , videos , instructional DVDs and instructional apps for iPhone , iPad , Android and Kindle devices .
Stephan created and operates Grapplearts.com .
Stephan has helped tens of thousands of grapplers improve their skills via Stephan 's articles , videos , instructional DVDs and instructional apps for iPhone , iPad , Android and Kindle devices .
Stephan created and operates Grapplearts.com .