Here's a great little video featuring my brother in law Mark Jenkins and many other pioneers of physical limits.   Many question the sanity and motivation of these people.  Society will call them selfish, ego centric, foolish, crazy and more.   What truly holds you back from pushing your limits?  What has you staying safe? What has you rooted in the way it's always been?  I  applaud these courageous individuals for living by their own standards and not backing down in the face of noise from the masses.  We need examples of those among us who are willing to be bold and show the rest of us what is possible. To push past the limits of their comfort zones.