I don't know if anyone has seen this or if anyone else has got one but they are brilliant, as a qualifed gym instrutor, they are briiliant for your biecps, check it out.
Here is the world record holder
[yt]JCR8UDovPpA[/yt]
Here is the world record holder
[yt]JCR8UDovPpA[/yt]