Alexander Zass aka Samson
https://en.wikipedia.org/wiki/Alexander_Zass
Video footage
Book
The Mystery of the Iron Samson: The Life and Training of Strongman Alexander Zass
Training
- Training on static resistance (trying to move immovable objects, pull un-pullable chains apart)
He empirically attached great importance to isometry and believed that combined with dynamic exercises, it helped him to strengthen his tendons, develop superior strength, and keep him in shape for many many years.